Outlook 2007 multiple calendar sharing causes crash

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Hello, all,

I have a user who just got Outlook 2007 and currently has a personal
calendar shared out to some of her co-workers. She has now created a
second calendar for a project and wants to share that out as well to
some of the same people who already have her personal calendar and
some others who do not.

The problem is that when she tries to send out sharing invitiations,
most of the people she wants to share the new calendar out to already
have her personal calendar, and when she tries to send out the
invitation, Outlook crashes. This does not happen with all users. I
tried to send sharing invitations to a lot of people in the company,
including myself, one of my colleagues, and several of her office-
mates, and those got the "Share this calendar?" prompt. But when I
tried to send to this user's closer office-mates who have her personal
calendar, it would always crash Outlook and want to send an error
report. Make sense?

I do not know what can be causing this, and the only way I can see to
share the calendar is through the sharing invitations. I can't find a
way to open the calendar from the other users' machines.

Any help would be appreciated.

Thanks!