I found the base RegEx exression on a link on this site here:
http://http://www.imfirewall.us/protocols/view.php?proto=Skydrive
Here is how I made this work on the UTM:
Web Protection/Web Filtering Options
New rule Names: OneDrive
Checked: Skipping SSL Scanning, Certificate Trust Check/Certificate Date Check
Matching these URL's set to:
^http://^skyapi\.live\.net, ^.*(storage|skydrive|shared|onedrive)\.live\.com, ^.*\.mesh\.com, ^.*\.storage\.msn\.com, ^.*\.wns\.windows\.com, ^p\.sfx\.ms, ^9t57ha\.by3301\.livefilestore
Sophos needs to update the skydrive rules in the application control engine. Hope this helps all out there.
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