With External Access for Teams, you can add or invite anyone outside of your Teams org who uses Teams, Teams for personal use, Skype (for consumers), and Skype for Business to a one-to-one chat.

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For those who use Teams or Teams for personal use, this includes both one-to-one chats and new or existing group chats.

First things to know

If you invite someone who doesn’t have a Teams account, they’ll receive an invite to start an unmanaged Teams account and then join the chat with all chat history included.

People from different Teams orgs can be easily added to each other"s chats without sending invites.

External Access is turned on by default, but it can be turned off or restricted by an org’s admin, such as blocking certain addresses or domains.

An external label at the top of a chat indicates if there are any external participants in the chat. You"ll also see an identifying label beside the names of any external participants in one-to-one and group chat participant lists.


Add or invite someone from outside your org to a one-to-one chat

People you add or invite outside of your org to a one-to-one chat may include anyone who uses Teams, Teams for personal use, Skype, and Skype for Business.


Anyone who uses Skype or Teams for personal use can accept or block chat invites. You can block any incoming communication from them as well.

You can use a phone number to search for someone who uses Teams for personal use.

Skype and Skype for Business participants can only use plain text in a chat.

On the left side of Teams, select Chat

and then New chat
to start a new chat.

Type the person’s email addressor phone number that you want to invite to chat. ► If the name matches, such as someone you’ve invited before, select their name.► If there isn’t a name match, select Search externally to send them a chat invite. 


Add someone who uses Teams outside of your org to a group chat

People you add who are outside of your org to a new or existing group chat must use Teams or Teams for personal use. 

Note: Chat participants from different orgs that restrict or block communication with each other may be part of your group chat if your org is allowed to communicate with those orgs.

Start a new group chat and add participants

Follow the previous one-to-one chat steps, but add more than one person.

Type a message or select the arrow to the right to add a group name (optional) and then type a message.

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Note: A group chat is limited to 250 people, although each person may be from a different Teams org.

Add participants to an existing group chat

You may only add external access participants to existing or ongoing chats that already include at least one external access participant. Otherwise, you’ll create a new group chat with the internal participants and the one or more external participants that you’re adding.

Choose or be active in the existing group chat that you want to add the participants to.

Select View and add participants

below your profile picture at the upper right of Teams, and then choose
Add people.

Before you type any email addresses or phone numbers below Add, choose if and how you want to include any chat history. 


► If you see name matches under Add, choose the names, and then select Add. You’ll then see those people added to the group chat.

► If there isn’t an immediate name match for a person (no results found), choose Search externally to send them a chat invite.

More things to know

In most cases, all chat participants can view each other’s profiles.

Some outside orgs or external access capabilities may be blocked by your org, or your org may be blocked by them.

You can host an external group chat with up to 249 other orgs.

An external chat remains external even if all external participants are no longer part of the chat.

When you join an external group chat within an org, you are subject to the policies of that org. Also, the shortest retention policy applies, which are settings that determine how long a chat or message is kept.

An external chat becomes read-only if all participants in the org where the chat was created are removed from that org.

For more info about External Access and related settings, see Manage external access in Teams or check with your admin.

Related links

First things to know about group chats Leave or remove someone from a group chat Chat in a Teams meeting Advanced: Native chat experience for external (federated) users in Teams

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