We have seen this several times, and wanted to give our clients the update on what may be happening.
When you synchronize contacts between CRM and your users Outlook profile, if the contact to by synchronized has a birthday prior to Jan 1, 1970 Outlook will fail during synchronization.
You can test this on the offending machine by temporarily disabling synchronizing of contacts, and forcing a manual synchronization of contacts. If the sync works without issues, take a look into the application event log, and if the error resembles the following:
Process:OUTLOOK |Thread:2012 |Category: Unmanaged.Platform |User: PlatformUser |Level: Error | hr = 0×80070057. General Function:
COutlookSyncManager::BackgroundSync File: c:\bt\1690\src\application\outlook\addin\outlooksyncmanager.cpp
Line: 757
Grab the MS hotfix #948045 from here:
