I am using outlook 2003 sp2 and using .pst files as I am the only user. Each
Item I try to add gives me the same response. If i change an existing item
there is no problem.

"Jocelyn Fiorello [MVP - Outlook]" wrote:

That error message can come up from just about anything. We need more
information. What version of Outlook are you using? Are you using a .PST
file or are you connecting to an Exchange server? How many items are in the
Calendar folder you're trying to add to?

--
Jocelyn Fiorello
MVP - Outlook

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"Michael Haase" wrote:

When trying to add items to outlook calander, it returns an error message
saying unknown error with messenging interface. any help would be appreciated.