The easiest option is to reinstall Outlook and try again.
> Have an interesting issue with a user.
>
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>
> Thank you.
Thank you for your response.
I don't believe that this will resolve the problem, as the issue is related
to a Microsoft Exchange mailbox and it happens on all the other users when
they try and send one particular user a calendar request, whether his Outlook
is open or closed or if he is logged on to the domain or not.
The resolution I arrived at (which I was not too happy about doing, mind
you) was backing up his mailbox to a PST, removing his mailbox from the
Exchange mail store, recreating the mailbox in AD and then repopulating his
mailbox from the PST backup.
The users are now able to send and modify calendar requests to the end user.
Thank you.
> The easiest option is to reinstall Outlook and try again.