Support Outlook 2016 with SPX outlook add-in
Currently XG is still using version 1.3 of the outlook plug-in which does not support Outlook 2016. Can you please update the plugin/add-in on the XG User portal.
i have used this one : https://www.sophos.com/de-de/support/downloads/email/sophos-outlook-add-in.aspx
works for me.
the one you can download from xg directly doesnt work with 2016.