Note that a 64bit application cannot load or use 32bit code (dlls, exes, etc.), nor can a 32bit application use 64bit code.
If 64bit outlook is installed, then 64bit powershell must be used and the 64bit installer for PowerMAPI as well.
On a 64bit version of windows, powershell exists in 2 locations, respective of the ‘bitness’ of the executable. The 32bit version is at: %systemdrive%\windows\syswow64\WindowsPowerShell\v1.0 The 64bit version is at: %systemdrive%\windows\system32\WindowsPowerShell\v1.0
The PowerMAPI installer sets up the environment correctly for these cases and both the 32bit and 64bit versions can be installed, however it is unlikely that Microsoft will support both versions of any of the Outlook versions to be installed concurrently.
If the version of PowerMAPI does not match the version of Outlook, a dialog with text similar to “There is no default mail client…” will appear.
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