Error 273 Selection Manager not initialized

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