CRM 4: The caller id does not match the subscription owner id.

In CRM 4, I've been seeing this error a lot lately:

"The caller id does not match the subscription owner id. Only subscription owners may perform subscription operations."

when trying to open the options in the Outlook CRM Client

This forum has the fix.

just exit outlook, open regedit, remove this key:

HKEY_CURRENT_USER\Software\Microsoft\MSCRMClient\OutlookSyncSubscriptionId

and restart Outlook.