PRB: Duplicate Messages on Server When Synchronizing OST (181738)
The information in this article applies to:
- Microsoft Extended Messaging Application Programming Interface (MAPI)
- Microsoft Outlook 97 8.01
- Microsoft Outlook 97 8.02
- Microsoft Outlook 97 8.03
This article was previously published under Q181738 SYMPTOMS
When creating a transport provider, you may want to try to do
synchronization with the server like the Exchange Transport does. To
accomplish this, you copy the messages to the offline store (Offline Folder
Storage - OST). When you reconnect to the server, the messages copied to
the OST are copied back to the server resulting in duplicate messages on
the server.
CAUSE
The Exchange/OST store treats the messages as though they were created in
the OST and then replicates them back to the server. Since the OST is only
an ICS (Incremental Change Synchronization) client and not an ICS server,
third parties can not access its replication method. Any message created in
the OST outside of the OST's synchronization process is thought to be a new
message.
RESOLUTION
The only way to prevent duplicate messages is to delete the message on the
server after their transport moves them to the OST.
Note that delivering the messages to the OST and deleting them on the
server breaks the single instance storage of the messages on the server
when the messages are replicated back to the server.
STATUS
This behavior is by design.
| Modification Type: | Minor | Last Reviewed: | 8/18/2005 |
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| Keywords: | kbMsg kbprb KB181738 |
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