Bitness : How to identify Outlook 2010 installation is a 32-bit or 64-bit?

When Outlook 2010 is installed, it sets the new registry key named Bitness, which indicates whether the Outlook 2010 installation is a 32-bit or 64-bit version. This can be useful to administrators who want to audit computers to determine the installed versions of Outlook 2010 in their organizations.

  • Registry path: HKEY_LOCAL_MACHINE\Software\Microsoft\Office\14.0\Outlook
  • Registry key: Bitness
  • Value: either x86 or x64

For more information about Microsoft Office 2010 in 64-bit, see 64-bit editions of Office 2010.