Find out Whether You Are Using 32-Bit or 64-Bit Outlook

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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 add-ons or plug-ins.

The Difference Between 32-Bit and 64-Bit

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 add-on or plug-in version.

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.

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

Determine Which Version You Have

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).