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_MACHINESOFTWAREMicrosoftOffice14.0Outlook 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.