How to check which user enable OWA or POP3?

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From: Come2 (admin_at_contact.idv.tw)
Date: 05/18/04 

Date: Wed, 19 May 2004 07:47:40 +0800

Dear sir:

I want to check that which user have already enable OWA or POP3 function in
Exchange, Does there have any tools or method can check about this?

Many thanks for your reply!