"MercuryM" <Mercu***@discussions.microsoft.com> wrote in message
news:4C67F20E-9CCD-471A-AF9C-5AC30E80C09C@microsoft.com...
> Have a problem after migrating from Windows 2000 and Exchange 2000 to Win
> 2003 and Exchange 2003. One user using Outlook 2007 is getting
> intermittent
> Undeliverable errors when sending e-mail or calendar requests to one
> specific
> Exchange user on same domain. All other e-mail traffic internally or
> externally is working perfectly with both users involved. This user with
> Outlook 2007 was working fine with Win 2000 and Exchange 2000.