outlook mac 2011 error 50

This is from a Microsoft Answers forum - it deals with both Entourage and Outlook:

Error -50

An unknown error (-50) occurred

• One user found this solution: Run "Remove Office", then run Repair Permissions. Install from your CD and apply all updates. Restart and then run Repair Permissions again.
• Another cause for this error was found by J. Gorman: I had a semicolon in my outgoing server name.
• Another user reported this fixed the issue for them: Try creating a new Entourage identity and setting up your email account. When the email address is verified with the new identity and you receive your e-mail, then try switching back to the identity that you had a problem with and check your mail. This solved the problem for me.
• Christoph Nadig, reported this solution: I found old mails in my outbox that were never delivered (for an unknown reason), but everytime I wrote a new mail, Entourage tried to send them again, leading to a -50 error everytime. Deleting these old entries in my outbox resolved the problem.

Clinton

Had the same problem, thanks for your answer, saved me a lot of time, indeed I had a semicolon in my outgoing server name too.