CRM/Outlook Sync Issues

We are currently using CRM 3.0 with about 85 users that access it via the Outlook Desktop client.  The ones having the issue are all using Windows XP with Office 2007, both fully patched.

We keep getting a large number of errors in the Sync Issues folders that seem related to CRM appointments.  Weve noticed with a lot of these users that once they the number of sync error notifications grow that it seems to slow outlook down drastically.

As a temporary fix we have been just deleting these items out of their Sync Issues folders to help speed Outlook back up.  What wed like to do is find out what is actually causing these sync issues in the first place.  We have tried to research the error message associated with the sync errors but havent been able to find a solution.
      
Ive included an example of item below.  It seems to get a very large amount of errors from a single item.

10:11:24 Error synchronizing message Message Name
10:11:24                 [80070005-508-80070005-1340]
10:11:24                 You do not have sufficient permission to perform this operation on this object.  See the folder contact or your system administrator.
10:11:24                 Microsoft Exchange Information Store
10:11:24                 For more information on this failure, click the URL below:
10:11:24                 http://www.microsoft.com/support/prodredirect/outlook2000_us.asp?err=80070005-508-80070005-1340
10:11:24 Moved a message that failed synchronization to 'Local Failures'. Message subject -> 'Message Name'. You can view this message in your offline folder file only.
10:11:24 Done

Im not sure if I explained that very well but if you have any questions please dont hesitate to ask.  If you have any suggestions or ideas please dont hesitate to let us know.

Thanks,
Joe