This is pretty close, though of course you should title it "How to determine which Outlook version number I’m using if I'm not using a Mac?" But having to know the version you have before you can determine the version you have limits its functionality somewhat, dontchathink? Better: If you have a Windows PC: If you have Help on your menu bar, click Help / About Microsoft Outlook to obtain the version, 2003 or 2007. Otherwise, click File on your menu bar. If you see Help, click Help to see the version (2010 or 2013) Otherwise, if you see Office Account, click Office Account to see your Subscription Product version. Otherwise, Microsoft has changed it again. If you have a Mac: While in Outlook, click on the menubar item ”Outlook” (next to the Apple logo in the top left corner of the screen). A window will appear with the version (2008, 2011 or 15.x)