Contacts callerID / Phone identification
It’s a missing part of outlook. It would be graet if the name of a contact of the outlook internal contacts will be displayed when called. It’s important if you want to use commercial and private contacts separated due to eu laws.
Small apps like SecureContactspro or SecurePIM are needed to make it work. I expect that a big company like Microsoft is also able to integrate that function directly without the need of a third party app.