Outlook 2003 users receive the error message "Unknown error" while doing things like deleting emails.
The users simply click OK and the error goes away. Then when they try to do what they were originally trying to do (such as deleting an email) they are usually able to do so without any problems.
This has started happening after the company's Exchange server has been migrated from Exchange 2003 to Exchange 2010.
What do I need to do to fix this issue so that users will stop receiving this "Unknown error" message within Outlook 2003?
The user's client computers are Windows 7, Windows 7 64-bit, Windows Vista, and Windows XP SP2.
Please provide me with the exact steps.