Before I installed Office 2003 I had 2000 and was able to click on a name in
the Contacts box of the Contact form and go to that contact I get error
message:

"Cannot perform requested operation.  The command selected is not valid for
this recipient".

When I click on help I get the following message:
You have most likely attempted to view the calendar for a user who has one
or more of the following issues:
•    Is not part of your domain.
•    Is not listed in the LDAP.
•    Is not a member of your Exchange Server.
•    Has not granted you the necessary permissions to view their calendar.
To avoid this error message, use the Open Calendar command only if the
attendee is using Exchange Server.  If the user uses Exchange Server and you
still encounter an error message, ask the attendee for the appropriate
permissions to view their calendar.  If they are not part of your network, it
is very likely you cannot gain access to their calendar.
I’m not doing anything with the Calendar