You can't remove her personal calendar, but if she has rights to open her
boss' calendar (not just the calendar thru file | open, but to really open
the other mailbox so it shows up in the folder list view), she can view the
Outlook toolbar and drag a shortcut to it there.
If she can't open the other mailbox, have the boss grant her at least
"reviewer" permissions to the root of his/her mailbox folder (outlook today)
and then the user can add it to her Exchange server properties, advanced
tab, additional mailboxes.
