Jamie,
I experienced the same pop up issue requesting my ENP with Office 2007 /
Vista OS on Outlook every few seconds. I did a couple things that resolved
the issue. I had more than one email account listed in Outlook. I deleted one
of them and recreated the same account and deleted the former. Leaving only
the one account. Apparently this refreshes the email acount with new Vista /
Office 2007 settings.
Go to Tools in Outlook and click on Account Settings. You will see your
email accounts listed.
Hope this helps.
Ted