I am using Outlook for Mac 2011 with an Exchange Online account hosted through Office 365. Every time I send an email to anyone through Outlook for Mac 2011, their email address is automatically added to my Exchange Contacts list, cluttering up my Exchange Contacts list with a bunch of random email addresses I don't want in there.

Is there anyway to turn this feature off? 

This is also happening for emails I send through OWA in a web browser or the OWA apps for iPhone and iPad.

I'm having issues joining the Office 365 Community, but working to get my account going there so I can post over there as well.

Thanks!

Nathan