We’re supporting the addition of Mail Contacts as Guests in Office 365 Groups. We’ll begin rolling this feature out in the next few days.
This message is associated with Office 365 Roadmap ID 15043.
How does this affect me?
This feature will only affect your tenant if you have Groups & Guest access enabled. With this update, you can now add mail contacts (external contacts in your organization directory) as guests in Office 365 Groups.
We’ll be gradually rolling this out to First Release customers starting next week, and the roll out to the rest of the world will happen soon after.
What do I need to do to prepare for this change?
You don’t need to do anything, but may consider updating your user training, and notifying your helpdesk. Please click Additional information to learn more.