Entourage X error...

[Ken]

Hello,
I have been using Entourage for a few weeks without any problems,
until I launched the program this am and got the following error:

<The server returned the following error

The requested message could not be converted to an RFC-822 compatible
format. Please contact your administrator.>

Also, Entourage doesn't alert me when I have mail as it did before.
I didn't set any preferences differently, this problem happened out of
the blue!

Thanks in advanve,
Ken