Verify the version of outlook so you know for sure and try reinstalling (or
repairing) it. I just did a quickie test with both Outlook 2000 and 2002 and
they both load ok and check mail. (Outlook 2000 requires corp mode, Internet
only mode requires wab.dll, which does not exist in Vista.)

I know Outlook 98 gave that error message - but I don't recall if 2000 or
2002 ever did. Because of security problems in Outlook 98, it's really
better if you upgrade to Outlook 2007 or switch to the mail and calendar
programs in Vista instead.

--
Diane Poremsky [MVP - Outlook]
Author, Teach Yourself Outlook 2003 in 24 Hours
Need Help with Common Tasks? http://www.outlook-tips.net/beginner/
Outlook 2007: http://www.slipstick.com/outlook/ol2007/

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"Chris Posey" wrote in message
news
I just installed Vista Business yesterday. Now, I am unable to open Outlook
(I believe it's Outlook 2002). I get the following message:

Cannot start Microsoft Outlook. Outlook requires Microsoft Outlook Express
4.01 or greater. You can install Outlook Express by running IE5Setup.exe
from
the IE5 folder located on your CD or through the Windows Update website."

I tried to run IE5Setup.exe, but I get a msg. that says a newer version is
installed, and then it terminates. I tried to revert back to IE6, but
there
is no IE7 option under Vista's new "Programs and Features" replacement of
Add/Remove Programs. I then attempted to roll back the update, but it does
not show that IE6 was even on my computer previously when I view my
updates
in Programs and Features. I tried to install the latest version of Outlook
Express, and I get the same mesage I got when I tried to install IE5
Setup.