Oh, you can have 4 digit passwords. You can even have NO passwords. But out of the box, 6 is the minimum length. Once you have created the Administrator's password and can access the system, you can then change the minimum password length to anything from 0 to 15 digits
After I installed the Partner Messaging Management software in Virtual XP-Mode, and completely backed up the system including messages, I looked around and found where passwords can be set to Zero, or up to 15 digits.
I am sure some people would complain over 15 digit passwords..tee hee
I attempted to set up voice mails to email, while reading the help files and found I needed the Unified Messaging software/service. I tracked it down. I discovered it will actually install and run as a service on Windows Server 2016. Will fiddle with it later today I hope.
I also found that I can forward messages to a voice mail box which is set up for e-mail and the messages will be sent.
This will save a lot of time, if it run with no hitches.