In Outlook 2010, Help is on the File tab.
Click About Outlook to see the full-sized About Microsoft Outlook dialog. To check the Outlook build number in Outlook 2013 and newer, click on the File tab, then Office Account. Office 2016 version and build numbers are also available at Version and build numbers of update channel releases Office 365 client update branch releases contains the a list of updates for the different branches. It can be up to four months before everyone reaches a milestone.
With the release of Office 2016 and four different branches on four different release schedules, having an older version number doesn't necessarily mean your Office isn't updated.
