Vista - Strange Error in windows Vista Mail (when sending it freaks out)

Hi all!

I've got a problem with windows vista mail..

When i start the mail client, it connects and retrives the mail..
If i send a mail, it sends it correctly..

BUT! when I press the send/recive button it says:
Error occured when the requested activities was processed, information is in
the page "ERROR" (translated from swedish to english) ..

But when i look at the page ERROR, it's empty .. so I must close the client
and open again, so it can check the mail.

I've tried almost anything... I'm starting to belive it's a bug?


/Jonas