How to Find out If You're Running 32-Bit or 64-Bit Outlook

Know your version so you can install compatible add-ins and plug-ins

The Microsoft Outlook email application is installed in either a 32-bit version or a 64-bit version. Computers running the 64-bit version likely have more resources, such as processing power and memory, but Outlook runs much the same regardless of which version you have.

You'll need to know if you have 32-bit or 64-bit Outlook before you install add-ins or plug-ins. Here's a quick way to check the Outlook version.

Instructions in this article apply to Outlook for Microsoft 365, Outlook 2019, Outlook 2016, Outlook 2013, and Outlook 2010. Outlook 2007 and older versions were available only in 32-bit versions.

What Version of Outlook Are You Running?

The 64-bit version of Office is automatically installed unless you select the 32-bit version before beginning the installation process. If you're unsure which version of Outlook you have, here's how to find out if you have the 32-bit or 64-bit version of Outlook:

  1. Select File > Office Account.

    Outlook 2016 File and Office Account menu selected
  2. Select About Outlook.

    Outlook 2016 About Outlook option selected
  3. The top of the About Outlook box shows the version number and 32-bit or 64-bit distinction.

Outlook in Office 2010 has a slightly different interface. There's no Office Account, option. Instead, select Help. The product version displays on the right side of the page along with whether it's 32-bit or 64-bit.

Now that you know which version of Outlook you're using, you'll be able to select the correct add-ins and plug-ins for your system.