My calendar shows that I'm out of office all month (March).

your assumptions are the same as mine;
"Must be a meeting that was set up as an all-month meeting." NOPE.
I can't/don't see ANY month long meetings.
It is everyone else in the office, when they try to plan a meeting with me,
who see that on my "availability" I am "Out of Office" for the entirety of
March, 2006.
We use an exchange server.
No one else has the problem.
Gone through several dozens of settings, and have also done a "Detect and
Repair."
No dice.
Odd. Anyone else ever have this?