Hi Mark,
I am having a similar problem with Outlook 2007 after changing to Win 7. This is what I wrote on another forum but no takers yet:
Outlook 2007 &Win 7.
I am having problems sending emails to some addresses and get this message from "System Administrator":
Your message did not reach some or all of the intended recipients.

Subject: FW: Election
Sent: 07/02/2010 16:54

The following recipient(s) cannot be reached:

Where does this come from?
Not Norton because it does it with NIS uninstalled.
Not ISP because it doesn't happen on my XP laptop.


It's really frustrating because my correspondence is now split between my PC and my laptop.
P.S. It tries all three of the accounts I have on Outlook and the failure message comes back to a different account to that which sent it.

Thanks for the validation -- at least I know I'm not going crazy. Wondering if it's worth the $39.99 MS charges for a support chat for Outlook 2003. Are they good at disgnosisng and fixing complex issues like this?

Hi Mark,
It might be the only way but is there a time limit? Before ruling Norton out, I spent hours on the phone doing various test emails; uninstalling re-installing etc. so be ready for a big phone bill.
By the way, the other aspect is not being able to do a clean un-install for Office although you may be better placed to do that on XP. That is what I would try first in your position. Unfortunately the MS procedure for clean uninstall doesn't seem to work on Win 7