Office Customization Tool (OCT) 2016 Help: Remove previous installations
Applies to: Office Professional Plus 2016, Office Standard 2016
Summary: Specifies previous versions of Office applications to keep or remove.
This option only applies when Office is first installed on a user's computer. By default, Setup removes all previous versions of Office applications. To keep an installed Office application, complete the following steps:
Select Remove the following earlier versions of Microsoft Office programs.
Select the Office application that you do not want to remove, and then choose Details.
Under Choose which earlier versions you want Setup to remove, clear the check box, and then choose OK.
Outlook 2016 cannot coexist with previous versions of Outlook. If you choose to keep a previous version, do not install Outlook 2016.