Outlook 2003 / Exchange 2010 SP1 Sync Errors 8004010f-501-8004010f-0

We have about 4000 Outlook 2003 SP3 clients that are getting the following Sync errors in there Sync Issues folder.  Any ideas?

10:42:46 Synchronizer Version 11.0.8303
10:42:46 Synchronizing Mailbox 'Test User01'
10:42:46 Synchronizing Hierarchy
10:42:47        1 folder(s) updated in offline store
10:42:47 Synchronizing server changes in folder 'Calendar'
10:42:47 Downloading from server 'casarray.testdomain.com'
10:42:47 Synchronizing server changes in folder 'Sent Items'
10:42:47 Downloading from server 'casarray.testdomain.com'
10:42:47 Error synchronizing folder
10:42:47          [8004010F-501-8004010F-0]
10:42:47          The client operation failed.
10:42:47          Microsoft Exchange Server Information Store
10:42:47          For more information on this failure, click the URL below:
10:42:47          http://www.microsoft.com/support/prodredirect/outlook2000_us.asp?err=8004010f-501-8004010f-0
10:42:47 Downloading from server 'casarray.testdomain.com'
10:42:47 Error synchronizing folder
10:42:47          [8004010F-501-8004010F-0]
10:42:47          The client operation failed.
10:42:47          Microsoft Exchange Server Information Store
10:42:47          For more information on this failure, click the URL below:
10:42:47          http://www.microsoft.com/support/prodredirect/outlook2000_us.asp?err=8004010f-501-8004010f-0
10:42:47 Done
10:42:47 Microsoft Exchange offline address book
10:42:47 Download successful

This just started since we migrated from Exchange 2003 to Exchange 2010 SP1 RU2.

Thanks again