Calender sharing Exchange 2010 issues

Have a customer that is running RPC over HTTP using Outlook 2010 for managing calenders .

I have 3 calenders that work just fine ,but when attempting to accept and send reply for a new user ,the email just errs out ,no specific errors ,just  could not complete.

Any ideas?
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Do you have any screen shots you can provide?  There must be some kind of error..
pgm554Author Commented:
still working
Still working means?
pgm554Author Commented:
Gave up on it.
Moving customer to new Exchange server next month ,so not worth time and effort right now.

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pgm554Author Commented:
moving on
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