Use has issue with Outlook calendar

Hi all,

I have a user who is having two different issues with her Outlook calendar.
She is using a Windows XP operating system with Outlook 2003 on an Exchange
2003 server. She is an office assistant so she is a delegate for other users
and has a view of multiple calendars from her Outlook. Following are the
issues:

1. She all of a sudden is seeing gmail appointments in her Outlook calendar.
Only one user has a gmail account but those calendar appointments do not
appear in that user's Outlook account. They only appear in the office
assistant's calendar.

2. Sometimes when one of the users who she is a delegate for accepts a
meeting, it displays as if she (the office assistant) has accepted the
meeting and not the original acceptor.

Does anyone have any useful information on what may be going on here and how
to resolve these issues? I would be greatly appreciative if anyone could shed
some light!

Thanks,
LaurenM