How to Find Out Whether You Are Using 32-Bit or 64-Bit Outlook

Follow These Step-by-Step Instructions

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While Outlook itself runs much the same whether you have the 32- or 64-bit version installed, it is critical to know which version you have installed so you can choose and install the correct Outlook add-ons or plug-ins.

For instance, older add-ons such as the Calendar Printing Assistant is only compatible with the 32-bit Outlook. Similarly, applications that integrate with Outlook at MAPI level need to be 64-bit or the integration is lost. Additionally, the real benefits of using 64-bit Outlook lie in the ability to use Excel and other Office applications using 64-bit addressing and the support for (much) larger files in (much) more memory that it brings.

Find Out Whether You Are Using 32-Bit or 64-Bit Outlook by Windows Release

The version of Outlook you use is critical to know when adding plug-ins. Outlook add-ons work with either the 32-bit or the 64-bit version of Outlook, and it is important to install the correct—corresponding—plug-in or plug-in version.

So, which version should you get? Outlook itself can tell you whether you have its 32-bit or the 64-bit edition installed.

Here's How, Step-by-Step

To find out whether your Outlook is the 64-bit or the 32-bit version:

  • Click FILE in Outlook.
  • In Outlook 2013 and 2016:
    • Select Office Account.
    • Click About Outlook under Product Information.
  • In Outlook 2010:
    • Select Help.
  • Look for 64-bit or 32-bit included with the Outlook version information near the top of the About Microsoft Outlook dialog (Outlook 2013) or under About Microsoft Outlook.
  • In Outlook 2007, you have the 32-bit package (it's the only way it came).