Attendee Names Blank in meeting request???

I have this weird problem that just started happening. Sometimes when a user creates a meeting, once people have accepted or rejected the attendee names come up blank. Here is a screenie. It only happens in Outlook 2007 and 2003 (Exchange 2000). Has anyone seen anything like this?

When searching the solution from internet, I got follow good websites, keeping them for study:

http://www.slipstick.com/calendar/ 

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