Outlook 2010 connecting to my proxy server?

Hello everyone,
Something I've noticed recently.  I've been filtering my proxy server for certain sites my clients are going to, and I've noticed large amounts of traffic from my clients pc's who are using Outlook 2010 trying to get to my internal 2010 exchange server via the following urls:
http://autodiscover.xxx  and https://trpmail.xxx.local
Does Outlook 2010 use internet explorer's proxy settings by any chance, and hence why I'm seeing all this traffic to my proxy?  Or is this caused by some other misconfiguration?
Thanks Guys
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Outlook uses Autodiscover for autoconfiguration of user accounts. If the traffic hits your proxy server - it means that something (probably DNS) is misconfigured.

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