Fatal Error has occired

[Michael]

Outlook has stopped sending and receiving to any of my
eMail accounts. I tried deleting all the accounts and
resetting them. Although the Test Message works in the
Account setup, no messages can be sent. And when you
open eMail message and press the account drop down bos
you get the message "Unable to complete the operation. A
fatal error has occured in Outlook"

Any Suggestions