For SOGo authentication, especially against external providers need extensive testing.
Over Christmas I'll build a NS7-RC3 ARM-repository, if all goes well it could be in the release announcement.
For ARM we have to consider some limitations. Although technically not impossible running a SAMBA AD is rather changeling on limited resources.
@denis.robel do you think we can include the web filter modules for arm? Are there arm/architecture dependent problems I can help with?