If you have installed Outlook and the Groupware Client in the 32 bit version and now want to change to the 64 bit version or vice versa, please proceed as follows:
Close Outlook and all other components of Office
Uninstall the Groupware Client
Uninstall Microsoft Office
Install Microsoft Office in the new bit variant
Install the Groupware Client in the new bit variant
The Outlook profile and the data file(s) of the Groupware Client can be used unchanged. Only if you switch from a higher Outlook version to a lower one (e.g. from Outlook 2019 to Outlook 2013) at the same time, you have to create a new profile and data file to ensure the complete consistency of the data.