Silly question, but have you checked their free/busy status? All day events marked as busy or out of office?

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Milly Staples [MVP - Outlook]

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After furious head scratching, Lorin Spaulding asked:

| I have two Outlook users on Exchange 2003 Server whose schedules show
| them as busy 24/7 when other users invite them to meetings - their own
| calendars look fine, account settings and Outlook options look fine.
| Anybody know what's going on here? Thanks in advance...