新機能：ネイティブフェデレーションチャット

As previously announced in MC182673, June 2019, we are making it possible to have richer conversations with people outside your organization within Microsoft Teams chat. The rollout has taken longer than expected to ensure and optimal experience for customers. 

• We’ll be gradually rolling this out to customers in early November 2019. 
• The roll out will be completed worldwide by early December 2019.  

This message is associated with Microsoft 365 Roadmap ID 52394

How does this affect me?

Teams users can now message Teams users from different organizations and enjoy the richer Teams messaging experience using stickers, @ mentions, and images. 

The external access policy applies only to Teams chat. 

What do I need to do to prepare for this change?

The native experience will be offered for chats where the sender and the receiver users have an upgrade mode policy set to TeamsOnly.

By default, external access is turned on in Teams. If you add blocked domains, all other domains will be allowed; if you add allowed domains, all other domains will be blocked. Set up external access in the Teams admin center (Org-wide settings > External access). 

If you want external users to also have access to teams and channels, consider using guest access instead of external access.  

• Compare external and guest access 
• Manage external access in Microsoft Teams 
• Native chat experience for external (federated) users in Microsoft Teams