1--I went from Windows 8.1 to Windows 10 Insider preview; then it upgraded a couple of days ago.
2--I uninstalled Office 2016 preview (according to instructions), then re-installed it.
3--It opens in Safe mode, and gets me to the Add User page. I tried this, and fill out the Exchange user info. It does Establish Network Connection, then Searching for .... it gets stuck at this point. Then it says "We are having group connection....",
i retry, ditto.
4--If i quit this, it goes back to the msg.
It is possible that this is happening because I am using the Windows 10 Mail App? I have that app set to my Exchange account, and receive mail fine. I also have W 2016 on a MAC and it worked fine.
5--I also tried add account from the Control Panel / Mail for Office 2016 applet. Tried to add the user
6--I tried the Exchange ActiveSync server, still does not work.