

This is because since Office 95 (version 7.0), all Office applications started sharing the same version number. The version numbering of Office itself skips number 5 and 6. Outlook was first introduced in Office 97 which had the version number 8.0.
#OFFICE 2011 EXCHANGE 2007 SP 1 FOR MAC LICENSE#
This is because Office 2016 and Office 2019 now use the same code-base as Microsoft 365 and your license determines which features are enabled.Īt the same time, this change also increases (or to be more technically correct doesn’t decrease) compatibility with add-ins and external applications which explicitly look at the version number.

HKEY_CURRENT_USER\Software\Microsoft\Office\ \Outlook Office 2019 is not version 17.0?Īs you can see, since Outlook 2016 the version number is stuck at 16.0 and Office 2019 didn’t become version 17.0. This version number is used for stamping the installation files of Outlook and is also used in the Registry, with the most known Registry hive being
