I have an Exchange Contact in my Global Address List from an external
organization. When that external contact accepts a meeting request from me,
and then I go to open the meeting to edit it, they appear in the list of
attendees 3 times. Each of the instances of them as an attendee resolves
back to the same Exchange Contact, and I have no Outlook Contact for them in
my personal Contacts.

On the test meeting I created with them today which they accepted (once) I
see their name 3 times, with 2 of them listed as accepted.

Their Exchange Contact is a member of 3 different Exchange Distribution
Groups on my server.

This has of course resulted in issues when someone from my org sets up a
meeting with this person and then modifies it, as when they send the update,
the external user gets the update notification 3 times, making life
confusing.

Any idea on what's going on here? I've found this KB article:
http://support.microsoft.com/kb/924249/en-us that seems to address this.
Not sure if that's my solution or not. I currently do not have "Resolve
Anonymous Email" enabled on my default SMTP Virtual Server.

Version info:

Our end: Exchange 2003 SP2, Outlook 2000 as a client
Their end: Exchange 2003 SP2, Outlook 2003 as a client

Thanks for any insights!

Phil