Now for everyone in need.
I have the same problem and no way to fix it.
But there is a rellatively simple work-around:
- Go to your Windows directory: "C:\Windows\Media" and look for the file "Windows Notify Email.wav".
- Copy this file to your Android smartphone in the folder "Phone\Notifications" (it has to be on the phone, not the microSD card!)
-- If not already there, just create it yourself. (note the spelling!)
3. Now you can find the Outlook sound among the standard Android notification sounds.
(In the same way, completely custom sounds are also possible)
Enjoy the sound :)