Why this matters
Most of the confusion in Teams comes from posting in the wrong place. A question gets lost in a busy group chat, a sensitive budget goes into a channel the whole department can read, or someone creates a fifth team for a two-week task. This lesson gives you a map of how Teams is organised and a simple way to choose the right place.
Plan note (checked November 2026): Teams, channels and team owners are part of work or school accounts on Microsoft 365 business and enterprise plans. Teams for personal use (the free consumer version) has no teams and channels. It has communities instead, and Microsoft says communities in Teams for personal use will stop being available from December 2026. Personal users should use group chats instead. In a corporate tenant, IT may also limit who can create teams, private channels or shared channels, as covered in Level 1.
The map: four building blocks
Think of your organisation as an office building:
- A team is a project room with a member list. It has owners, who manage settings and membership, and members. A team can be private, so people join by invitation, or public, so anyone in the organisation can join.
- A channel is a labelled table inside the room, used for one topic such as "Launch-Marketing" or "Supplier issues". Posts in a channel stay organised by topic and remain there for later readers.
- A one-to-one chat is a quick word with one colleague.
- A group chat is a small huddle of named people. It has no topics, so everything goes into one stream. A group chat holds up to 250 people, but some features switch off once a chat has more than 20 people, including calling from the chat.
In the current Teams layout, the Chat area shows chats, teams and channels together by default. To switch to separate Chat and Teams areas, select More list options (…) at the top of the chat list, then Customize view, then Separate.
The three channel types
Every team has standard channels. Owners, and members if the owners allow it, can add private and shared channels.
| Channel type | Who can see it | Use it when |
|---|---|---|
| Standard | Every member of the team, including guests in the team | The topic concerns the whole team |
| Private | Only the people added to that channel. They must already be team members. | A subset of the team needs a confidential space, such as hiring or budgets |
| Shared | Only the people added to that channel. They can come from outside the team, or from another organisation if both organisations' IT allow it. | You need to work with people who should not join the whole team, such as a partner company |
Two points to remember:
- Guests (outside people added to a team) can take part in standard and private channels but not in shared channels. Shared channels use a different external route that needs a work or school account on the other side.
- Other team members cannot see a private or shared channel they have not been added to. If you cannot find a channel a colleague mentions, you probably have not been added to it.
Decide: chat, channel post or new team?
Work through these questions in order:
- Is it quick, personal or short-lived ("Can you check my slide?")? Use a one-to-one chat.
- Does it involve a handful of named people for a short time (arranging a lunch, a one-off fix)? Use a group chat.
- Does it belong to an ongoing piece of work an existing team already covers, and will others need to find it later? Use a post in the right channel of that team.
- Is it ongoing work but sensitive to some team members? Use a private channel.
- Does it need people outside the team or organisation, without giving them the whole team? Use a shared channel, if your IT allows it.
- Is it a new, long-running area of work with its own group of people that no existing team fits? Only then create a new team.
Example: A start-up is preparing a product launch.
- "Is the demo room booked?" goes in a one-to-one chat.
- The weekly launch status goes in a post in the Launch team's standard channel.
- Freelancer fees go in a private channel for the founders.
- Daily coordination with the partner agency goes in a shared channel.
Find a team's channels, members and owners
Desktop and web
The steps are the same in the desktop app and at teams.microsoft.com.
- Open Chat (combined view) or Teams (separate view) and find the team name.
- Expand the team to see the channels you can access. A lock icon marks a private channel.
- Next to the team name, select More options (…) and then Manage team.
- Open the Members tab. Owners and members are listed separately. Expand Members and guests to see the full list.
- For a private or shared channel, go to the channel name and select More options (…), then Manage channel, then Members.
Mobile (iOS and Android)
- Tap Teams (or find the team in your chat list) and select the team.
- Tap the team name, then More options (…).
- Tap View members. Team owners see Manage members instead.
Note: you cannot create shared channels in the mobile app. Use desktop or web for that.
Your task: map your own work
Do this now (about 15 minutes):
- Open Teams on desktop or web and list every team you belong to.
- For one team, write down its owners, roughly how many members it has, and any private or shared channels you can see.
- Repeat step 2 on your phone and note any difference in what you see.
- Pick three real conversations from your work this week. For each one, use the six questions above to decide on a chat, a channel post (and which channel type) or a new team, and write one line explaining why.
- If one of them is in the wrong place now, move the next message there.
Key takeaways
- A team is a group of people. Channels organise its topics. Chats are for people, not topics.
- Standard channels are visible to the whole team, private channels to selected team members, and shared channels to selected people inside or outside the team.
- Guests can join standard and private channels, but not shared channels.
- Default to a channel post for ongoing team work, and create a new team only for a new, long-running group.
- Find members and owners under More options > Manage team > Members on desktop and web, or More options > View members on mobile.
- Teams and channels need a work or school plan, and your IT team can restrict which ones you can create.