New email error in Outlook 2003

[Sam Gill]

Hi,

Get an error when trying to create a new msg or replying to in Outlook 2003

" The messaging interface has returned an unknown error" restart Outlook

Just upgraded from Office XP Outlook to Outlook 2003 shipped with SBS 2003
Std.

Have applied all the lastest Office updates today, and run a detect and
repair but still getting the msg.

Any ideas any help apprecaited!

Sam