Detect whether Office is 32bit or 64bit via the registry

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From TechNet article on 64-bit editions of Office 2010:

If you have installed Office 2010
including Microsoft Outlook 2010,
Outlook sets a registry key named
Bitness of type REG_SZ on the computer on which it is installed. The
Bitness registry key indicates whether the Outlook 2010 installation
is 32-bit or 64-bit. This may be
useful to administrators who are
interested in auditing computers to
determine the installed versions of
Office 2010 in their organization.

  • Registry path: HKEY_LOCAL_MACHINE\Software\Microsoft\Office\14.0\Outlook
  • if you have installed Office 2013 then use this
    Registry path: HKEY_LOCAL_MACHINE\Software\Microsoft\Office\15.0\Outlook
  • Registry key: Bitness
  • Value: either x86 or x64

and elsewhere in the same article:

Starting with Office 2010, Outlook is
available as a 32-bit application and
a 64-bit application. The version
(bitness) of Outlook that you choose
depends on the edition of the Windows
operating system (32-bit or 64-bit)
and the edition of Office 2010 (32- or
64-bit) that is installed on the
computer, if Office is already
installed on that computer.

Factors that determine the feasibility
of installing a 32-bit or a 64-bit
version of Outlook include the
following:

  • You can install 32-bit Office 2010 and 32-bit Microsoft Outlook 2010 on a supported 32-bit or 64-bit edition of the Windows operating system. You can install the 64-bit version of Office 2010 and 64-bit Outlook 2010 only on a supported 64-bit operating system.
  • The default installation of Office 2010 on a 64-bit edition of the Windows operating system is 32-bit Office 2010.
  • The bitness of an installed version of Outlook is always the same as the bitness of Office 2010, if Office is installed on the same computer. That is, a 32-bit version of Outlook 2010 cannot be installed on the same computer on which 64-bit versions of other Office 2010 applications are already installed, such as 64-bit Microsoft Word 2010 or 64-bit Microsoft Excel 2010. Similarly, a 64-bit version of Outlook 2010 cannot be installed on the same computer on which 32-bit versions of other Office applications are already installed.

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