diff --git a/Signal/src/ViewControllers/ColorPickerViewController.swift b/Signal/src/ViewControllers/ColorPickerViewController.swift
index bbb5753a9..6756447b8 100644
--- a/Signal/src/ViewControllers/ColorPickerViewController.swift
+++ b/Signal/src/ViewControllers/ColorPickerViewController.swift
@@ -391,8 +391,7 @@ private class MockIncomingMessage: TSIncomingMessage {
                    expiresInSeconds: 0,
                    quotedMessage: nil,
                    contactShare: nil,
-                   serverTimestamp: nil,
-                   serverGuid: nil)
+                   serverTimestamp: nil)
     }
 
     required init(coder: NSCoder) {
diff --git a/Signal/src/ViewControllers/DebugUI/DebugUIMessages.m b/Signal/src/ViewControllers/DebugUI/DebugUIMessages.m
index 42b1f91a6..10c8959c0 100644
--- a/Signal/src/ViewControllers/DebugUI/DebugUIMessages.m
+++ b/Signal/src/ViewControllers/DebugUI/DebugUIMessages.m
@@ -3727,8 +3727,7 @@ typedef OWSContact * (^OWSContactBlock)(YapDatabaseReadWriteTransaction *transac
                                                                expiresInSeconds:0
                                                                   quotedMessage:nil
                                                                    contactShare:nil
-                                                                serverTimestamp:nil
-                                                                     serverGuid:nil];
+                                                                serverTimestamp:nil];
                 [message markAsReadNowWithSendReadReceipt:NO transaction:transaction];
                 break;
             }
@@ -3768,8 +3767,7 @@ typedef OWSContact * (^OWSContactBlock)(YapDatabaseReadWriteTransaction *transac
                                                                expiresInSeconds:0
                                                                   quotedMessage:nil
                                                                    contactShare:nil
-                                                                serverTimestamp:nil
-                                                                     serverGuid:nil];
+                                                                serverTimestamp:nil];
                 [message markAsReadNowWithSendReadReceipt:NO transaction:transaction];
                 break;
             }
@@ -4231,8 +4229,7 @@ typedef OWSContact * (^OWSContactBlock)(YapDatabaseReadWriteTransaction *transac
                                                                expiresInSeconds:0
                                                                   quotedMessage:nil
                                                                    contactShare:nil
-                                                                serverTimestamp:nil
-                                                                     serverGuid:nil];
+                                                                serverTimestamp:nil];
                 [message markAsReadNowWithSendReadReceipt:NO transaction:transaction];
             }
             {
@@ -4273,8 +4270,7 @@ typedef OWSContact * (^OWSContactBlock)(YapDatabaseReadWriteTransaction *transac
                         expiresInSeconds:60
                            quotedMessage:nil
                             contactShare:nil
-                         serverTimestamp:nil
-                              serverGuid:nil];
+                         serverTimestamp:nil];
     // private setter to avoid starting expire machinery.
     message.read = YES;
     [message save];
@@ -4596,8 +4592,7 @@ typedef OWSContact * (^OWSContactBlock)(YapDatabaseReadWriteTransaction *transac
                                                    expiresInSeconds:0
                                                       quotedMessage:quotedMessage
                                                        contactShare:nil
-                                                    serverTimestamp:nil
-                                                         serverGuid:nil];
+                                                    serverTimestamp:nil];
     [message markAsReadNowWithSendReadReceipt:NO transaction:transaction];
     return message;
 }
diff --git a/SignalServiceKit/src/Messages/Interactions/TSIncomingMessage.h b/SignalServiceKit/src/Messages/Interactions/TSIncomingMessage.h
index 8b68a06bb..203921d1d 100644
--- a/SignalServiceKit/src/Messages/Interactions/TSIncomingMessage.h
+++ b/SignalServiceKit/src/Messages/Interactions/TSIncomingMessage.h
@@ -13,7 +13,6 @@ NS_ASSUME_NONNULL_BEGIN
 @interface TSIncomingMessage : TSMessage <OWSReadTracking>
 
 @property (nonatomic, readonly, nullable) NSNumber *serverTimestamp;
-@property (nonatomic, readonly, nullable) NSString *serverGuid;
 
 - (instancetype)initMessageWithTimestamp:(uint64_t)timestamp
                                 inThread:(nullable TSThread *)thread
@@ -55,8 +54,7 @@ NS_ASSUME_NONNULL_BEGIN
                                 expiresInSeconds:(uint32_t)expiresInSeconds
                                    quotedMessage:(nullable TSQuotedMessage *)quotedMessage
                                     contactShare:(nullable OWSContact *)contactShare
-                                 serverTimestamp:(nullable NSNumber *)serverTimestamp
-                                      serverGuid:(nullable NSString *)serverGuid NS_DESIGNATED_INITIALIZER;
+                                 serverTimestamp:(nullable NSNumber *)serverTimestamp NS_DESIGNATED_INITIALIZER;
 
 - (instancetype)initWithCoder:(NSCoder *)coder NS_DESIGNATED_INITIALIZER;
 
diff --git a/SignalServiceKit/src/Messages/Interactions/TSIncomingMessage.m b/SignalServiceKit/src/Messages/Interactions/TSIncomingMessage.m
index 816b501d8..0dbd5cc93 100644
--- a/SignalServiceKit/src/Messages/Interactions/TSIncomingMessage.m
+++ b/SignalServiceKit/src/Messages/Interactions/TSIncomingMessage.m
@@ -21,7 +21,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, getter=wasRead) BOOL read;
 
 @property (nonatomic, nullable) NSNumber *serverTimestamp;
-@property (nonatomic, nullable) NSString *serverGuid;
 
 @end
 
@@ -49,7 +48,6 @@ NS_ASSUME_NONNULL_BEGIN
                                    quotedMessage:(nullable TSQuotedMessage *)quotedMessage
                                     contactShare:(nullable OWSContact *)contactShare
                                  serverTimestamp:(nullable NSNumber *)serverTimestamp
-                                      serverGuid:(nullable NSString *)serverGuid
 {
     self = [super initMessageWithTimestamp:timestamp
                                   inThread:thread
@@ -68,7 +66,6 @@ NS_ASSUME_NONNULL_BEGIN
     _sourceDeviceId = sourceDeviceId;
     _read = NO;
     _serverTimestamp = serverTimestamp;
-    _serverGuid = serverGuid;
 
     return self;
 }
diff --git a/SignalServiceKit/src/Messages/OWSMessageManager.m b/SignalServiceKit/src/Messages/OWSMessageManager.m
index 91091efd4..88ee36ec8 100644
--- a/SignalServiceKit/src/Messages/OWSMessageManager.m
+++ b/SignalServiceKit/src/Messages/OWSMessageManager.m
@@ -1115,7 +1115,6 @@ NS_ASSUME_NONNULL_BEGIN
     NSData *groupId = dataMessage.group ? dataMessage.group.id : nil;
     OWSContact *_Nullable contact = [OWSContacts contactForDataMessage:dataMessage transaction:transaction];
     NSNumber *_Nullable serverTimestamp = (envelope.hasServerTimestamp ? @(envelope.serverTimestamp) : nil);
-    NSString *_Nullable serverGuid = (envelope.hasServerGuid ? envelope.serverGuid : nil);
 
     if (dataMessage.group.type == SSKProtoGroupContextTypeRequestInfo) {
         [self handleGroupInfoRequest:envelope dataMessage:dataMessage transaction:transaction];
@@ -1230,8 +1229,7 @@ NS_ASSUME_NONNULL_BEGIN
                                                                expiresInSeconds:dataMessage.expireTimer
                                                                   quotedMessage:quotedMessage
                                                                    contactShare:contact
-                                                                serverTimestamp:serverTimestamp
-                                                                     serverGuid:serverGuid];
+                                                                serverTimestamp:serverTimestamp];
 
                 [self finalizeIncomingMessage:incomingMessage
                                        thread:oldGroupThread
@@ -1271,8 +1269,7 @@ NS_ASSUME_NONNULL_BEGIN
                                                        expiresInSeconds:dataMessage.expireTimer
                                                           quotedMessage:quotedMessage
                                                            contactShare:contact
-                                                        serverTimestamp:serverTimestamp
-                                                             serverGuid:serverGuid];
+                                                        serverTimestamp:serverTimestamp];
 
         [self finalizeIncomingMessage:incomingMessage
                                thread:thread