How do you know if your Outlook installation is 32-bit or 64-bit?

Content
  1. Find your version so you can install compatible add-ons and plug-ins
  2. Check if your Outlook is 32-bit or 64-bit (2013 and later)
  3. Determine bit version for Outlook 2010
  4. Outlook 32-bit or 64-bit Outlook

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

While Outlook itself works pretty much the same whether you have 32-bit or 64-bit installed, it’s very important to know which one you have when installing add-ons or plug-ins. The main difference is that the 64-bit version has more computing power and can process more data.

The instructions in this article apply to Outlook 2019, 2016, 2013, 2010, and Outlook for Office 365. Outlook 2007 and earlier were only available in 32-bit versions.

Check if your Outlook is 32-bit or 64-bit (2013 and later)

Outlook can tell you if you have a 32-bit or 64-bit version by following these steps. The steps below apply to Outlook 2019, 2016, 2013, and Outlook for Office 365. The process is different in Outlook 2010 and is described in the next section.

  1. Select File > Office account .

  2. Select About Outlook in the Product Information section on the right.

  3. At the top of the About Outlook window, you’ll see Outlook’s version name, version number, and installed bit version, either 32-bit or 64-bit.

Determine bit version for Outlook 2010

Outlook 2010 has a slightly different interface than later versions. With a few clicks, you will know whether Outlook 2010 is 32-bit or 64-bit.

Click File > reference . In the far right pane, under “About Microsoft Outlook”, you will find the version number and, in parentheses, the 32-bit or 64-bit version.

Outlook 32-bit or 64-bit Outlook

The version of Outlook you are using matters when adding plugins. Outlook add-ons are designed to work with both 32-bit and 64-bit versions; Installing an incompatible add-on or plug-in can cause problems with your software.

For example, older add-ons like Calendar Print Assistant are only compatible with 32-bit Outlook. Likewise, applications that integrate with Outlook using the Messaging Application Program Interface (MAPI) must be 64-bit or else the integration will fail.

The benefits of using the 64-bit version of Outlook include the ability to use Excel and other Office applications with 64-bit addressing, as well as support for larger files and more memory than the 32-bit version allows.

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