Previously read email reappears as unread after 15 minutes or so.

C

Chipmat

I have a client who 15 minutes after opening an email or mousing over
it to display it in the preview plane, has them reappear as unread.
This is only occurring on about 5 or 6 emails & is not affecting the
other 100 or so emails that he has. Is this a settings issue w/ his
Entourage, or is it server related?
 
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