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.

• Anonymous
  January 22, 2010
  In the beta, I find this value only in HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftOffice14.0Outlook. Has it changed in later builds?

• Anonymous
  January 22, 2010
  Hi Carl, Under x64 systems, the registry keys will be available in the path, as you specified: HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftOffice14.0Outlook. Hope this helps.

• Anonymous
  January 23, 2010
  Thanks for that confirmation Deva. But what's the point of this value on 32-bit systems... ...which can run only 32-bit Office?

• Anonymous
  February 03, 2010
  I suppose what you would do is check if HKEY_LOCAL_MACHINESOFTWAREWow6432NodeMicrosoftOffice14.0Outlook exists (or simply try to read the Bitness value). If it doesn't exist, assume 32-bit.