All these versions have their own version numbers which have nothing to to with the current versioning scheme. After “Microsoft Outlook 2001 for Macintosh” came Entourage which offered Exchange connectivity for Mac users. Their names are Outlook for MS-DOS, Outlook for Windows 3.x, and Outlook for Macintosh. Outlook 97 replaced the applications Schedule+ and Exchange Client which were previously bundled with respectively Office and Exchange Server.īefore Outlook 97 there were already clients called Outlook bundled with Exchange. Its next version for Office 95 would become version Word 7.0 so that version number was taken for the entire Office 95 suite. Word at the time was in its 6.0 version and with that it had the highest version number.
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. 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
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