F.H. Muffman said:
Windows Mobiles does do Over-the-air sync of calendar and contacts, but
not over POP3.
At some point, you attached your windows mobile phone to your computer
running Outlook and synced the information down *or* you've configured
Windows Mobile to sync Over-the-air using Exchange active-sync. I will
100% guarantee you it is *not* syncing over pop3.
Even if a calendar request was sitting in your inbox and you did a pop3
download, windows mobile will not recognize that item as a meeting request
and add it to your calendar.
Your best best, seriously, is to talk to your exchange admin about having
some mobile access to your email.