An example of the items in the Sync Issues folder:

21:42:49 Synchronizer Version 11.0.6361
21:42:49 Synchronizing Mailbox 'Fedotov, Andrei'
21:42:49 Synchronizing local changes in folder 'Corporate Deals'
21:42:49 Uploading to server 'svr00ex.esops.com'
21:42:49 Error synchronizing message 'Blueprint'
21:42:49 [8004010F-501-0-1380]
21:42:49 The client operation failed.
21:42:49 Microsoft Exchange Server Information Store
21:42:49 For more information on this failure, click the URL below:
21:42:49
http://www.microsoft.com/support/pro...10f-501-0-1380
21:42:49 Moved a message that failed synchronization to 'Local Failures'.
Message subject -> 'Blueprint'. You can view this message in your offline
folder file only.
21:42:50 1 item(s) changed read-state in online folder
21:42:50 Done

and

23:06:53 Synchronizer Version 11.0.6361
23:06:53 Synchronizing Mailbox 'Fedotov, Andrei'
23:06:53 Synchronizing local changes in folder 'Corporate Deals'
23:06:53 Uploading to server 'svr00ex.esops.com'
23:06:54 Error synchronizing message 'Residual Deuce'
23:06:54 [8004010F-501-0-1380]
23:06:54 The client operation failed.
23:06:54 Microsoft Exchange Server Information Store
23:06:54 For more information on this failure, click the URL below:
23:06:54
http://www.microsoft.com/support/pro...10f-501-0-1380
23:06:54 Moved a message that failed synchronization to 'Local Failures'.
Message subject -> 'Residual Deuce'. You can view this message in your
offline folder file only.
23:06:54 Done



This started after we upgraded our users to OL 2003. We have found no
solution online for this problem, only that the problem exists