Are you syncing with a PDA or smartphone? That is the typical cause...
otherwise, check your autoarchive settings - tools, options, other,
autoarchive and also on the folder properties. See
http://www.slipstick.com/tutorials/auto/archive.htm for screenshots.
Outlook Tips by email:
mailto:dailytips-subscribe-request@lists.outlooktips.net
EMO - a weekly newsletter about Outlook and Exchange:
mailto:EMO-NEWSLETTER-SUBSCRIBE-REQUEST@PEACH.EASE.LSOFT.COM
Do you sync your mailbox with a smartphone or pda?
http://forums.slipstick.com/showthread.php?t=39473
"Marbeck" <Marbeck@discussions.microsoft.com> wrote in message
news:38CB3650-D296-43E1-A6C5-D15954800718@microsoft.com...
> I noticed that the appointments in my calendar are disappearing from my
> calendar after 6 mos. How can I stop this from happening?