The default installer for Office 365 is the 32-bit version. If you need the 64-bit version of Office, we'll show you how to get it.

FInd out how to clean uninstall 32-bit Microsoft Office & install 64-bit. This version is better if you have 64-bit computer & work with large data sets daily.

From here, click Additional install options. In the drop-down menu, select to install either the 32-bit or 64-bit version of the Office 2016 Preview.

If you want to install 64-bit Office 2010, you must uninstall all 32-bit Office products first, and then run setup.exe in the x64 folder. If you want to install 32-bit Office 2010, close this setup.