Upgraded to the Office 2016 preview (via 365 subscription), and the Avast! add-in doesn’t load (though it is listed as an add-in on the options page).
Actually, it looks like the program is still flagging mail with *** SPAM *** etc, but is not displayed on the ribbon
Currently this program is a preview version and still in development. It will take months and months to make the final version. During preview phrase, program will change from time to time and it will function differently. Like other programs, until the program goes into final version it won’t work properly with other program in this case with Avast Antivirus