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Guest access for Office 365 Groups
Guest access for Office 365 Groups has been https://blogs.office.com/2016/09/08/introducing-guest-access-for-office-365-groups/and is being rolled out in stages: "Starting today, group owners ca...
Yes, this can be controllable by Admins, please refer to How to administer external users in Office 365 Groups.
For some reason, Guest function suddenly disappear from Oct. 12. Why?