I use Win XP. I have used OL 2K with no problems for about 4.5 yrs. Last week I made a Calendar entry in a time slot and when I moved the pointer to another time slot, the first entry disappeared and a window popped up with:

"Could not save item. The messaging interface has returned an unknown error. If the problem persists, restart Outlook."

I've restarted OL. I've rebooted. I've tried the Win XP restore feature. I've used the repair feature on the OL disk. I've tried re installing OL. Nothing has worked.

My email, contacts, notes, etc. all work ok. The problem is just in the calendar.

I also have a PDA, and when I HotSync it, everything syncs except the calendar and it says - failed.

Does anyone have any suggestions or solutions?