Email Services - Frequently Asked Questions:
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Can I use my PennKey to authenticate to the Exchange service?
No. Your Exchange password is a completely separate set of credentials from your PennKey.
While there are many ways to access Exchange (Outlook 2003/2007, Outlook Web Access,
on and off campus, etc), the only authentication method that works for all of them is
using an Exchange-specific password.
ISC highly recommends that you do not use your PennKey password as the password for any other
account. Do not use your PennKey password as your Exchange password.
Information Systems and Computing, University of Pennsylvania