diff --git a/MessagesBridge.xcodeproj/project.pbxproj b/MessagesBridge.xcodeproj/project.pbxproj
index 45d0d86..2be70e3 100644
--- a/MessagesBridge.xcodeproj/project.pbxproj
+++ b/MessagesBridge.xcodeproj/project.pbxproj
@@ -75,6 +75,8 @@
 		CD602062219B68950024D9C5 /* MBIMSendMessageOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = CD602061219B68950024D9C5 /* MBIMSendMessageOperation.m */; };
 		CD83E156219BE10A00F4CCEA /* hooking.m in Sources */ = {isa = PBXBuildFile; fileRef = CD83E155219BE10A00F4CCEA /* hooking.m */; };
 		CD83E166219BE91600F4CCEA /* agentHook.m in Sources */ = {isa = PBXBuildFile; fileRef = CD83E165219BE91600F4CCEA /* agentHook.m */; };
+		CDE4556421A3578A0041F5DD /* IMChat+Encoded.m in Sources */ = {isa = PBXBuildFile; fileRef = CDE4556321A3578A0041F5DD /* IMChat+Encoded.m */; };
+		CDE455A121A365AD0041F5DD /* MBIMMarkOperation.m in Sources */ = {isa = PBXBuildFile; fileRef = CDE455A021A365AD0041F5DD /* MBIMMarkOperation.m */; };
 		CDF62335219A895D00690038 /* main.m in Sources */ = {isa = PBXBuildFile; fileRef = CDF62334219A895D00690038 /* main.m */; };
 		CDF62339219A8A5600690038 /* MBIMBridge.h in Sources */ = {isa = PBXBuildFile; fileRef = 1A0C4469219A4BC300F2AC00 /* MBIMBridge.h */; };
 		CDF6233A219A8A5600690038 /* MBIMBridge.m in Sources */ = {isa = PBXBuildFile; fileRef = 1A0C446A219A4BC300F2AC00 /* MBIMBridge.m */; };
@@ -215,6 +217,10 @@
 		CD83E161219BE91500F4CCEA /* libagentHook.dylib */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.dylib"; includeInIndex = 0; path = libagentHook.dylib; sourceTree = BUILT_PRODUCTS_DIR; };
 		CD83E165219BE91600F4CCEA /* agentHook.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = agentHook.m; sourceTree = "<group>"; };
 		CD83E1B5219BF78E00F4CCEA /* hookAgent.sh */ = {isa = PBXFileReference; lastKnownFileType = text.script.sh; path = hookAgent.sh; sourceTree = "<group>"; };
+		CDE4556221A3578A0041F5DD /* IMChat+Encoded.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "IMChat+Encoded.h"; sourceTree = "<group>"; };
+		CDE4556321A3578A0041F5DD /* IMChat+Encoded.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = "IMChat+Encoded.m"; sourceTree = "<group>"; };
+		CDE4559F21A365AD0041F5DD /* MBIMMarkOperation.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MBIMMarkOperation.h; sourceTree = "<group>"; };
+		CDE455A021A365AD0041F5DD /* MBIMMarkOperation.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MBIMMarkOperation.m; sourceTree = "<group>"; };
 		CDF62332219A895D00690038 /* kordophoned */ = {isa = PBXFileReference; explicitFileType = "compiled.mach-o.executable"; includeInIndex = 0; path = kordophoned; sourceTree = BUILT_PRODUCTS_DIR; };
 		CDF62334219A895D00690038 /* main.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = main.m; sourceTree = "<group>"; };
 		CDF62340219A9AAA00690038 /* EmailFoundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = EmailFoundation.framework; path = Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.Internal.sdk/System/Library/PrivateFrameworks/EmailFoundation.framework; sourceTree = DEVELOPER_DIR; };
@@ -487,6 +493,8 @@
 			children = (
 				CD14F1A2219FF22700E7DD22 /* IMMessageItem+Encoded.h */,
 				CD14F1A3219FF22700E7DD22 /* IMMessageItem+Encoded.m */,
+				CDE4556221A3578A0041F5DD /* IMChat+Encoded.h */,
+				CDE4556321A3578A0041F5DD /* IMChat+Encoded.m */,
 			);
 			path = Categories;
 			sourceTree = "<group>";
@@ -501,6 +509,8 @@
 				CD60205B219B623F0024D9C5 /* MBIMMessagesListOperation.m */,
 				CD60205D219B674B0024D9C5 /* MBIMConversationListOperation.h */,
 				CD60205E219B674B0024D9C5 /* MBIMConversationListOperation.m */,
+				CDE4559F21A365AD0041F5DD /* MBIMMarkOperation.h */,
+				CDE455A021A365AD0041F5DD /* MBIMMarkOperation.m */,
 				CD602060219B68950024D9C5 /* MBIMSendMessageOperation.h */,
 				CD602061219B68950024D9C5 /* MBIMSendMessageOperation.m */,
 				CD14F19F219FE7D600E7DD22 /* MBIMUpdatePollOperation.h */,
@@ -783,8 +793,10 @@
 				CD14F1A4219FF22700E7DD22 /* IMMessageItem+Encoded.m in Sources */,
 				CD602062219B68950024D9C5 /* MBIMSendMessageOperation.m in Sources */,
 				CD14F1A1219FE7D600E7DD22 /* MBIMUpdatePollOperation.m in Sources */,
+				CDE455A121A365AD0041F5DD /* MBIMMarkOperation.m in Sources */,
 				CD602056219B5DFD0024D9C5 /* MBIMBridgeOperation.m in Sources */,
 				CD60205F219B674B0024D9C5 /* MBIMConversationListOperation.m in Sources */,
+				CDE4556421A3578A0041F5DD /* IMChat+Encoded.m in Sources */,
 				1AA43E8F219EBB2D00EDF1A7 /* MBIMJSONDataResponse.m in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/kordophone/Bridge/MBIMBridge.m b/kordophone/Bridge/MBIMBridge.m
index cce8c65..ff2e01a 100644
--- a/kordophone/Bridge/MBIMBridge.m
+++ b/kordophone/Bridge/MBIMBridge.m
@@ -106,12 +106,12 @@ static NSString *const MBIMBridgeToken = @"net.buzzert.kordophone";
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_chatRegistryDidLoad:) name:IMChatRegistryDidLoadNotification object:nil];
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_chatItemsDidChange:) name:IMChatItemsDidChangeNotification object:nil];
     
-    [[NSNotificationCenter defaultCenter] addObserverForName: IMChatRegistryUnreadCountChangedNotification
-                                                      object: nil
-                                                       queue: [NSOperationQueue mainQueue]
-                                                  usingBlock:^(NSNotification *note) {
-                                                      NSLog(@"Unread count changed: %d", (int)[[IMChatRegistry sharedInstance] unreadCount]);
-                                                  }];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_unreadCountChanged:) name:IMChatRegistryUnreadCountChangedNotification object:nil];
+}
+
+- (void)_unreadCountChanged:(NSNotification *)notification
+{
+    // Not a lot of useful information plumbed here...
 }
 
 - (void)_messageReceived:(NSNotification *)notification
@@ -124,7 +124,7 @@ static NSString *const MBIMBridgeToken = @"net.buzzert.kordophone";
         if (![message isFromMe]) {
             MBIMUpdateItem *updateItem = [[MBIMUpdateItem alloc] init];
             updateItem.changedChat = chat;
-            updateItem.message = message;
+            updateItem.addedMessage = message;
             
             [[MBIMUpdateQueue sharedInstance] enqueueUpdateItem:updateItem];
         } else {
@@ -140,7 +140,14 @@ static NSString *const MBIMBridgeToken = @"net.buzzert.kordophone";
 
 - (void)_chatItemsDidChange:(NSNotification *)notification
 {
-    NSLog(@"chat items changed: %@", notification);
+    IMChat *chat = [notification object];
+    if (chat) {
+        NSLog(@"Chat items change for GUID: %@", [chat guid]);
+        
+        MBIMUpdateItem *updateItem = [[MBIMUpdateItem alloc] init];
+        updateItem.changedChat = chat;
+        [[MBIMUpdateQueue sharedInstance] enqueueUpdateItem:updateItem];
+    }
 }
 
 #pragma mark -
diff --git a/kordophone/Bridge/MBIMHTTPConnection.m b/kordophone/Bridge/MBIMHTTPConnection.m
index 1aba86f..5773681 100644
--- a/kordophone/Bridge/MBIMHTTPConnection.m
+++ b/kordophone/Bridge/MBIMHTTPConnection.m
@@ -36,17 +36,26 @@
     
     NSURL *url = [NSURL URLWithString:path];
     NSString *endpointName = [url lastPathComponent];
+    
+    BOOL requestTimedOut = NO;
     Class operationClass = [MBIMBridgeOperation operationClassForEndpointName:endpointName];
     if (operationClass != nil) {
         _currentOperation = [[operationClass alloc] initWithRequestURL:url completion:completion];
         _currentOperation.requestBodyData = _bodyData;
         
         [[[MBIMBridge sharedInstance] operationQueue] addOperation:_currentOperation];
-        dispatch_semaphore_wait(sema, dispatch_time(DISPATCH_TIME_NOW, (int64_t)(60.0 * NSEC_PER_SEC)));
+        long status = dispatch_semaphore_wait(sema, dispatch_time(DISPATCH_TIME_NOW, (int64_t)(60.0 * NSEC_PER_SEC)));
+        if (status != 0) {
+            requestTimedOut = YES;
+        }
     } else {
         response = [[HTTPErrorResponse alloc] initWithErrorCode:404];
     }
     
+    if (requestTimedOut) {
+        response = [_currentOperation cancelAndReturnTimeoutResponse];
+    }
+    
     return response;
 }
 
diff --git a/kordophone/Bridge/MBIMUpdateQueue.h b/kordophone/Bridge/MBIMUpdateQueue.h
index 9eb15b1..b66ed94 100644
--- a/kordophone/Bridge/MBIMUpdateQueue.h
+++ b/kordophone/Bridge/MBIMUpdateQueue.h
@@ -13,7 +13,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 @interface MBIMUpdateItem : NSObject
 @property (nonatomic, strong) IMChat *changedChat;
-@property (nonatomic, strong) IMMessage *message;
+@property (nonatomic, strong) IMMessage *addedMessage;
+
+- (NSDictionary *)dictionaryRepresentation;
 @end
 
 typedef void (^MBIMUpdateConsumer)(MBIMUpdateItem *item);
@@ -23,6 +25,8 @@ typedef void (^MBIMUpdateConsumer)(MBIMUpdateItem *item);
 + (instancetype)sharedInstance;
 
 - (void)addConsumer:(MBIMUpdateConsumer)consumer;
+- (void)removeConsumer:(MBIMUpdateConsumer)consumer;
+
 - (void)enqueueUpdateItem:(MBIMUpdateItem *)item;
 
 @end
diff --git a/kordophone/Bridge/MBIMUpdateQueue.m b/kordophone/Bridge/MBIMUpdateQueue.m
index 30e4091..d8869ae 100644
--- a/kordophone/Bridge/MBIMUpdateQueue.m
+++ b/kordophone/Bridge/MBIMUpdateQueue.m
@@ -7,8 +7,15 @@
 //
 
 #import "MBIMUpdateQueue.h"
+#import "IMMessageItem+Encoded.h"
+#import "IMChat+Encoded.h"
+
+@interface MBIMUpdateItem (/*INTERNAL*/)
+@property (nonatomic, assign) NSUInteger messageSequenceNumber;
+@end
 
 @implementation MBIMUpdateQueue {
+    NSUInteger           _messageSequenceNumber;
     dispatch_queue_t     _accessQueue;
     NSMutableArray      *_consumers;
 }
@@ -30,6 +37,7 @@
     if (self) {
         _accessQueue = dispatch_queue_create("net.buzzert.MBIMUpdateQueue", DISPATCH_QUEUE_SERIAL);
         _consumers = [[NSMutableArray alloc] init];
+        _messageSequenceNumber = 0;
     }
     
     return self;
@@ -43,8 +51,19 @@
     });
 }
 
+- (void)removeConsumer:(MBIMUpdateConsumer)consumer
+{
+    __weak NSMutableArray *consumers = _consumers;
+    dispatch_async(_accessQueue, ^{
+        [consumers removeObject:consumer];
+    });
+}
+
 - (void)enqueueUpdateItem:(MBIMUpdateItem *)item
 {
+    _messageSequenceNumber++;
+    item.messageSequenceNumber = _messageSequenceNumber;
+    
     __weak NSMutableArray *consumers = _consumers;
     dispatch_async(_accessQueue, ^{
         for (MBIMUpdateConsumer consumer in consumers) {
@@ -58,4 +77,20 @@
 @end
 
 @implementation MBIMUpdateItem
+- (NSDictionary *)dictionaryRepresentation
+{
+    NSMutableDictionary *updateDict = [NSMutableDictionary dictionary];
+    updateDict[@"messageSequenceNumber"] = @(_messageSequenceNumber);
+    
+    if ([self changedChat]) {
+        updateDict[@"conversation"] = [[self changedChat] mbim_dictionaryRepresentation];
+    }
+    
+    if ([self addedMessage]) {
+        updateDict[@"message"] = [[self addedMessage] mbim_dictionaryRepresentation];
+    }
+    
+    return updateDict;
+}
+
 @end
diff --git a/kordophone/Bridge/Operations/MBIMBridgeOperation.h b/kordophone/Bridge/Operations/MBIMBridgeOperation.h
index 50d94c9..6b09950 100644
--- a/kordophone/Bridge/Operations/MBIMBridgeOperation.h
+++ b/kordophone/Bridge/Operations/MBIMBridgeOperation.h
@@ -26,6 +26,8 @@ typedef void (^MBIMBridgeOperationCompletionBlock)(NSObject<HTTPResponse> * _Nul
 + (nullable Class)operationClassForEndpointName:(NSString *)endpointName;
 - (instancetype)initWithRequestURL:(NSURL *)requestURL completion:(MBIMBridgeOperationCompletionBlock)completionBlock;
 
+- (NSObject<HTTPResponse> *)cancelAndReturnTimeoutResponse;
+
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/kordophone/Bridge/Operations/MBIMBridgeOperation.m b/kordophone/Bridge/Operations/MBIMBridgeOperation.m
index ebab0b1..40ee4f2 100644
--- a/kordophone/Bridge/Operations/MBIMBridgeOperation.m
+++ b/kordophone/Bridge/Operations/MBIMBridgeOperation.m
@@ -55,4 +55,10 @@
     return self;
 }
 
+- (NSObject<HTTPResponse> *)cancelAndReturnTimeoutResponse
+{
+    [self cancel];
+    return [[HTTPErrorResponse alloc] initWithErrorCode:500];
+}
+
 @end
diff --git a/kordophone/Bridge/Operations/MBIMConversationListOperation.m b/kordophone/Bridge/Operations/MBIMConversationListOperation.m
index 515d0ca..06c8473 100644
--- a/kordophone/Bridge/Operations/MBIMConversationListOperation.m
+++ b/kordophone/Bridge/Operations/MBIMConversationListOperation.m
@@ -8,6 +8,7 @@
 
 #import "MBIMConversationListOperation.h"
 #import "MBIMHTTPUtilities.h"
+#import "IMChat+Encoded.h"
 
 #import <IMCore/IMCore.h>
 
@@ -26,26 +27,7 @@
     
     NSMutableArray *conversations = [NSMutableArray array];
     for (IMChat *chat in chats) {
-        NSMutableDictionary *chatDict = [NSMutableDictionary dictionary];
-        chatDict[@"guid"] = [chat guid];
-        chatDict[@"displayName"] = [chat displayName];
-        chatDict[@"date"] = MBIMWebServerFormatRFC822([chat lastFinishedMessageDate]);
-        
-        IMMessage *lastMessage = [chat lastMessage];
-        if (lastMessage) {
-            chatDict[@"lastMessagePreview"] = [[lastMessage text] string];
-        }
-        
-        NSMutableArray *participantStrings = [NSMutableArray array];
-        for (IMHandle *participantHandle in chat.participants) {
-            NSString *participantString = [participantHandle displayNameForChat:chat];
-            if (participantString) {
-                [participantStrings addObject:participantString];
-            }
-        }
-        
-        chatDict[@"participantDisplayNames"] = participantStrings;
-        
+        NSDictionary *chatDict = [chat mbim_dictionaryRepresentation];
         [conversations addObject:chatDict];
     }
     
diff --git a/kordophone/Bridge/Operations/MBIMMarkOperation.h b/kordophone/Bridge/Operations/MBIMMarkOperation.h
new file mode 100644
index 0000000..742a51c
--- /dev/null
+++ b/kordophone/Bridge/Operations/MBIMMarkOperation.h
@@ -0,0 +1,17 @@
+//
+//  MBIMMarkOperation.h
+//  kordophoned
+//
+//  Created by James Magahern on 11/19/18.
+//  Copyright © 2018 James Magahern. All rights reserved.
+//
+
+#import "MBIMBridgeOperation.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MBIMMarkOperation : MBIMBridgeOperation
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/kordophone/Bridge/Operations/MBIMMarkOperation.m b/kordophone/Bridge/Operations/MBIMMarkOperation.m
new file mode 100644
index 0000000..31c5cd1
--- /dev/null
+++ b/kordophone/Bridge/Operations/MBIMMarkOperation.m
@@ -0,0 +1,60 @@
+//
+//  MBIMMarkOperation.m
+//  kordophoned
+//
+//  Created by James Magahern on 11/19/18.
+//  Copyright © 2018 James Magahern. All rights reserved.
+//
+
+#import "MBIMMarkOperation.h"
+#import <IMCore/IMCore.h>
+
+@implementation MBIMMarkOperation
+
++ (void)load { [super load]; }
+
++ (NSString *)endpointName
+{
+    return @"markConversation";
+}
+
+- (void)main
+{
+    NSObject<HTTPResponse> *response = nil;
+    do {
+        NSURLComponents *urlComponents = [NSURLComponents componentsWithURL:self.requestURL resolvingAgainstBaseURL:NO];
+        
+        NSString *guid = nil;
+        for (NSURLQueryItem *queryItem in [urlComponents queryItems]) {
+            if ([[queryItem name] isEqualToString:@"guid"]) {
+                guid = [queryItem value];
+                break;
+            }
+        }
+        
+        if (!guid) {
+            NSLog(@"No query item provided");
+            response = [[HTTPErrorResponse alloc] initWithErrorCode:500];
+            break;
+        }
+        
+        IMChat *chat = [sChatRegistry existingChatWithGUID:guid];
+        if (!chat) {
+            NSLog(@"Chat with guid: %@ not found", guid);
+            response = [[HTTPErrorResponse alloc] initWithErrorCode:500];
+            break;
+        }
+        
+        // TODO: be smarter about this and mark individual messages as read? Could lead
+        // to a race condition
+        if ([chat unreadMessageCount] > 0) {
+            [chat markAllMessagesAsRead];
+        }
+        
+        response = [[HTTPErrorResponse alloc] initWithErrorCode:200];
+    } while (0);
+    
+    self.serverCompletionBlock(response);
+}
+
+@end
diff --git a/kordophone/Bridge/Operations/MBIMSendMessageOperation.m b/kordophone/Bridge/Operations/MBIMSendMessageOperation.m
index 5b8e2e7..b84c655 100644
--- a/kordophone/Bridge/Operations/MBIMSendMessageOperation.m
+++ b/kordophone/Bridge/Operations/MBIMSendMessageOperation.m
@@ -22,13 +22,15 @@
 
 - (BOOL)_sendMessage:(NSString *)messageBody toChatWithGUID:(NSString *)chatGUID
 {
+    IMChat *chat = [sChatRegistry existingChatWithGUID:chatGUID];
+    
+    // TODO: chat might not be an iMessage chat!
     IMAccount *iMessageAccount = [[IMAccountController sharedInstance] bestAccountForService:[IMServiceImpl iMessageService]];
-    IMHandle *handle = [[iMessageAccount arrayOfAllIMHandles] firstObject];
+    IMHandle *senderHandle = [iMessageAccount loginIMHandle];
     
     NSAttributedString *replyAttrString = [[NSAttributedString alloc] initWithString:messageBody];
-    IMMessage *reply = [IMMessage fromMeIMHandle:handle withText:replyAttrString fileTransferGUIDs:@[] flags:kIMMessageFinished];
+    IMMessage *reply = [IMMessage fromMeIMHandle:senderHandle withText:replyAttrString fileTransferGUIDs:@[] flags:kIMMessageFinished];
     
-    IMChat *chat = [sChatRegistry existingChatWithGUID:chatGUID];
     if (!chat) {
         NSLog(@"Chat does not exist: %@", chatGUID);
         return NO;
diff --git a/kordophone/Bridge/Operations/MBIMUpdatePollOperation.m b/kordophone/Bridge/Operations/MBIMUpdatePollOperation.m
index d0db0c9..5c3d40d 100644
--- a/kordophone/Bridge/Operations/MBIMUpdatePollOperation.m
+++ b/kordophone/Bridge/Operations/MBIMUpdatePollOperation.m
@@ -8,9 +8,10 @@
 
 #import "MBIMUpdatePollOperation.h"
 #import "MBIMUpdateQueue.h"
-#import "IMMessageItem+Encoded.h"
 
-@implementation MBIMUpdatePollOperation
+@implementation MBIMUpdatePollOperation {
+    __strong MBIMUpdateConsumer _updateConsumer;
+}
 
 + (void)load { [super load]; }
 
@@ -21,19 +22,27 @@
 
 - (void)main
 {
-    MBIMUpdateConsumer consumer = ^(MBIMUpdateItem *nextUpdateItem) {
-        NSDictionary *updateDict = @{
-            @"guid"    : [[nextUpdateItem changedChat] guid],
-            @"message" : [[nextUpdateItem message] mbim_dictionaryRepresentation]
-        };
+    __weak __auto_type weakSelf = self;
+    _updateConsumer = ^(MBIMUpdateItem *nextUpdateItem) {
+        NSDictionary *updateDict = [nextUpdateItem dictionaryRepresentation];
         
         MBIMJSONDataResponse *response = [MBIMJSONDataResponse responseWithJSONObject:updateDict];
-        self.serverCompletionBlock(response);
+        weakSelf.serverCompletionBlock(response);
     };
     
-    [[MBIMUpdateQueue sharedInstance] addConsumer:consumer];
+    [[MBIMUpdateQueue sharedInstance] addConsumer:_updateConsumer];
 }
 
-// TODO: cancel needs to remove the consumer from the update queue
+- (void)cancel
+{
+    [super cancel];
+    [[MBIMUpdateQueue sharedInstance] removeConsumer:_updateConsumer];
+}
+
+- (NSObject<HTTPResponse> *)cancelAndReturnTimeoutResponse
+{
+    [self cancel];
+    return [[HTTPErrorResponse alloc] initWithErrorCode:205]; // 205 = nothing to report
+}
 
 @end
diff --git a/kordophone/Bridge/Operations/Utilities/MBIMHTTPUtilities.h b/kordophone/Bridge/Operations/Utilities/MBIMHTTPUtilities.h
index 10f03d6..7ffc249 100644
--- a/kordophone/Bridge/Operations/Utilities/MBIMHTTPUtilities.h
+++ b/kordophone/Bridge/Operations/Utilities/MBIMHTTPUtilities.h
@@ -9,3 +9,4 @@
 #import <Foundation/Foundation.h>
 
 NSString* MBIMWebServerFormatRFC822(NSDate *date);
+NSString* MBIMWebServerFormatISO8601(NSDate *date);
diff --git a/kordophone/Bridge/Operations/Utilities/MBIMHTTPUtilities.m b/kordophone/Bridge/Operations/Utilities/MBIMHTTPUtilities.m
index 61bbd1a..00e0663 100644
--- a/kordophone/Bridge/Operations/Utilities/MBIMHTTPUtilities.m
+++ b/kordophone/Bridge/Operations/Utilities/MBIMHTTPUtilities.m
@@ -9,6 +9,7 @@
 #include "MBIMHTTPUtilities.h"
 
 static NSDateFormatter* _dateFormatterRFC822 = nil;
+static NSDateFormatter* _dateFormatterISO8601 = nil;
 static dispatch_queue_t _dateFormatterQueue = NULL;
 
 __attribute__((constructor))
@@ -20,6 +21,11 @@ static void __InitializeDateFormatter()
     _dateFormatterRFC822.timeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
     _dateFormatterRFC822.dateFormat = @"EEE',' dd MMM yyyy HH':'mm':'ss 'GMT'";
     _dateFormatterRFC822.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
+    
+    _dateFormatterISO8601 = [[NSDateFormatter alloc] init];
+    _dateFormatterISO8601.timeZone = [NSTimeZone timeZoneWithAbbreviation:@"GMT"];
+    _dateFormatterISO8601.dateFormat = @"yyyy-MM-dd'T'HH:mm:ss'+00:00'";
+    _dateFormatterISO8601.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
 }
 
 NSString* MBIMWebServerFormatRFC822(NSDate *date)
@@ -31,3 +37,13 @@ NSString* MBIMWebServerFormatRFC822(NSDate *date)
     
     return string;
 }
+
+NSString* MBIMWebServerFormatISO8601(NSDate *date)
+{
+    __block NSString *string = nil;
+    dispatch_sync(_dateFormatterQueue, ^{
+        string = [_dateFormatterISO8601 stringFromDate:date];
+    });
+    
+    return string;
+}
diff --git a/kordophone/Categories/IMChat+Encoded.h b/kordophone/Categories/IMChat+Encoded.h
new file mode 100644
index 0000000..6f3f09c
--- /dev/null
+++ b/kordophone/Categories/IMChat+Encoded.h
@@ -0,0 +1,17 @@
+//
+//  IMChat+Encoded.h
+//  kordophoned
+//
+//  Created by James Magahern on 11/19/18.
+//  Copyright © 2018 James Magahern. All rights reserved.
+//
+
+#import <IMCore/IMCore.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface IMChat (Encoded)
+- (NSDictionary *)mbim_dictionaryRepresentation;
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/kordophone/Categories/IMChat+Encoded.m b/kordophone/Categories/IMChat+Encoded.m
new file mode 100644
index 0000000..5bcac46
--- /dev/null
+++ b/kordophone/Categories/IMChat+Encoded.m
@@ -0,0 +1,40 @@
+//
+//  IMChat+Encoded.m
+//  kordophoned
+//
+//  Created by James Magahern on 11/19/18.
+//  Copyright © 2018 James Magahern. All rights reserved.
+//
+
+#import "IMChat+Encoded.h"
+#import "MBIMHTTPUtilities.h"
+
+@implementation IMChat (Encoded)
+
+- (NSDictionary *)mbim_dictionaryRepresentation
+{
+    NSMutableDictionary *chatDict = [NSMutableDictionary dictionary];
+    chatDict[@"guid"] = [self guid];
+    chatDict[@"displayName"] = [self displayName];
+    chatDict[@"date"] = MBIMWebServerFormatISO8601([self lastFinishedMessageDate]);
+    chatDict[@"unreadCount"] = @([self unreadMessageCount]);
+    
+    IMMessage *lastMessage = [self lastMessage];
+    if (lastMessage) {
+        chatDict[@"lastMessagePreview"] = [[lastMessage text] string];
+    }
+    
+    NSMutableArray *participantStrings = [NSMutableArray array];
+    for (IMHandle *participantHandle in self.participants) {
+        NSString *participantString = [participantHandle displayNameForChat:self];
+        if (participantString) {
+            [participantStrings addObject:participantString];
+        }
+    }
+    
+    chatDict[@"participantDisplayNames"] = participantStrings;
+    
+    return chatDict;
+}
+
+@end
diff --git a/kordophone/Categories/IMMessageItem+Encoded.m b/kordophone/Categories/IMMessageItem+Encoded.m
index 7305780..27e25d4 100644
--- a/kordophone/Categories/IMMessageItem+Encoded.m
+++ b/kordophone/Categories/IMMessageItem+Encoded.m
@@ -15,7 +15,7 @@
 {
     NSMutableDictionary *messageDict = [NSMutableDictionary dictionary];
     messageDict[@"text"] = [[self text] string];
-    messageDict[@"date"] = MBIMWebServerFormatRFC822([self time]);
+    messageDict[@"date"] = MBIMWebServerFormatISO8601([self time]);
     messageDict[@"sender"] = [[self sender] displayID];
     
     return messageDict;
@@ -29,7 +29,7 @@
 {
     NSMutableDictionary *messageDict = [NSMutableDictionary dictionary];
     messageDict[@"text"] = [[self body] string];
-    messageDict[@"date"] = MBIMWebServerFormatRFC822([self time]);
+    messageDict[@"date"] = MBIMWebServerFormatISO8601([self time]);
     messageDict[@"sender"] = [self sender];
     
     return messageDict;