Which Exchange version am I using?

There is an option to check your connection status which also displays the Exchange version number.

1. Start Outlook and connect to the Exchange server if this isn’t done automatically already.
2. Hold CTRL while clicking on the Outlook icon in the Notification Area
   (located in the right bottom area near the time; expand the Notification Area first if the Outlook icon does not show).

3. From the context menu that pops-up choose: Connection Status…

   

4. Scroll the horizontal scrollbar to the right to see the last column.
   (if the dialog is empty, then you are not connected to Exchange)
5. Here you’ll see a version number. Use the table below to determine which named version of Exchange it corresponds with.
   Your version number could be between 2 named versions. In that case, your named version corresponds with the lower version but with some additional update installed.

Note: For an overview of the Outlook version numbers see the post: Outlook versions and trivia.