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.

Windows 10 going forward will only offer a 64-bit version. It means you need to have 64-bit hardware to install a 64-bit OS. However, there are many computers still running on Windows 10 32-bit OS ...

More and more frequently, users are installing the 64-bit version of their operating system of choice over the less capable 32-bit version.