Q: How can I check if an installed copy of Outlook 2010 is the 32-bit or 64-bit version?

A: When Outlook 2010 is installed it sets a registry value, Bitness, at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\14.0\Outlook to either x86 (32-bit) or x64 (64-bit) to reflect the installation architecture of Outlook. You can check this registry value locally or remotely as part of a software audit or inventory.

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