This article explains how to determine if you have 32-bit or 64-bit Outlook. Instructions 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 to Know

  • In Outlook, select File > Office Account > About Outlook > at the top of the box, the version number and 32-bit or 64-bit will display.In Outlook 2010, select File > Help.

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:

  • Select File > Office Account.
  • Select About Outlook.
  • 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.

Select File > Office Account.

Select About Outlook.

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.

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