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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsOutlook uses “group” for two different features, and the steps for adding people depend on which one you mean. A Microsoft 365 Group provides shared collaboration resources; a contact list or Contact Group is a personal list of email recipients. Choose the matching instructions below.
| Feature | What it does | Where to manage it |
|---|---|---|
| Microsoft 365 Group | Shared conversations, a group mailbox, calendar, files, and collaboration resources | Groups in Outlook |
| Contact list or Contact Group | A personal collection of email addresses for sending messages to multiple people | People or Contacts |
Adding someone to a contact list does not give them access to a shared Microsoft 365 mailbox, calendar, files, or other group resources.
Add members to a Microsoft 365 Group
Use these steps when the group appears under Groups in Outlook. Microsoft 365 Group features require a qualifying work or school account, and your organization must have Microsoft 365 Groups enabled.
New Outlook for Windows
- Open New Outlook.
- Select Groups on the left-side app bar. You can also select Go to Groups from the mailbox folder list.
- Under Groups, select the group you want to update.
- Under the group name, select the text showing the group’s number of members.
- Select Add members.
- Enter the person’s name or email address.
- Select Add.
Repeat the last two steps for each person you want to include. When creating a new group, Outlook also lets you add members then or select Not now and add them later.
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Outlook on the web
- Sign in to Outlook on the web.
- Select Groups on the left-side app bar.
- Under the group name, select the text showing the number of members.
- Select Add members.
- Enter the names or email addresses.
- Select Add.
Classic Outlook for Windows
- Open the group through either More apps > Groups on the navigation bar or by expanding Groups in the mailbox folder list.
- On the ribbon, select Group Settings.
- Select Add Members.
- In the Add Members box, search for people in your organization by full name or email address.
- Select the people you want to add.
- Select Save.
Do not try to change Microsoft 365 Group membership through the Outlook Address Book. Microsoft says that membership cannot be edited there and that this workflow can produce an error. Use Group Settings instead.
Outlook for iPhone or Android
- Tap the Home icon to display your accounts.
- Select the Microsoft 365 account associated with the group.
- Tap Home again.
- Tap Groups.
- Tap the group name.
- Tap Info.
- If the group has three or fewer members, tap Add Members. If it has more than three, tap View all Members, then tap Add new members.
- Enter the names or email addresses and add the members.
Microsoft’s mobile instructions say that any group member can invite people, but only a group owner can remove members.
Add an external guest to a Microsoft 365 Group
A Microsoft 365 Group can include a guest using a personal, work, or school email address, provided your organization allows guest access. Microsoft says the guest receives a welcome email after being added.
New Outlook or Outlook on the web
- Select Groups.
- Select the group.
- Select the text showing the number of members.
- Select Add members.
- Enter the guest’s external email address.
- Select Add.
Classic Outlook for Windows
- Select the group under Groups in the folder pane.
- On the Groups ribbon, select Add Members.
- Enter the guest’s email address in the Add Members box.
- Press Enter.
- Select OK.
If Outlook will not accept the external address, your Microsoft 365 administrator may have disabled guest access or external sharing. A group owner cannot override those organization-wide restrictions from Outlook.
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Make a group member an owner
Owners can manage membership and other group settings. Microsoft recommends having at least two group owners so the group remains manageable if one owner leaves the organization or becomes unavailable.
- Open Groups in New Outlook or Outlook on the web.
- Select the group.
- Select the text showing the number of members.
- Find the person in the member list and select the arrow beside Member.
- Select Owner.
Remove a member from a Microsoft 365 Group
New Outlook or Outlook on the web
- Open Groups and select the group.
- Select the member-count text below the group name.
- Beside the person’s name, select Remove from group.
- Select Yes to confirm.
Classic Outlook for Windows
- Open the group.
- Select Group Settings on the ribbon.
- Select Edit Group.
- In the Members section, select Remove beside the person’s name.
- Select Save.
Microsoft’s current mobile instructions say only a group owner can remove a member.
Add members to a contact list in New Outlook or Outlook on the web
Choose this method when you need a personal list of email recipients, not shared Microsoft 365 resources.
- Open People from the side panel.
- Select All contact lists.
- Right-click the contact list, or select it and choose Edit from the ribbon.
- Add the contacts or email addresses.
- Select Save.
You can also open an individual contact, select Add to list, and choose an existing list or New contact list. A contact list can contain contacts or addresses with an email address.
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Add members to a Contact Group in classic Outlook for Windows
Classic Outlook uses the name Contact Group for the equivalent personal email list.
- Open classic Outlook.
- Select People on the side panel.
- Under My Contacts, select Contacts.
- Double-click the Contact Group.
- Select Add Members.
- Choose a source: From Outlook Contacts, From Address Book, or New E-mail Contact.
- Search for the person’s name or email address.
- Double-click the person’s name so it appears in the Members box.
- Select OK.
- Select Save and Close.
A classic Contact Group is normally saved in your own Contacts folder. Microsoft says changes do not update other people’s copies unless the Contacts folder is shared.
Add members to a contact list in Outlook.com
- Open Outlook.com and select People on the side panel.
- Select All contact lists.
- Right-click the contact list, or select it and choose Edit.
- Add the contacts or email addresses.
- Select Save.
Add a contact list in Outlook for Mac
- Select People.
- Select the Contacts folder under the account where you want the list.
- Hover over New Contact and select New Contact List.
- Enter the list name.
- Under Add members, enter an email address and select Add.
- Select Save.
For Microsoft Exchange accounts, Microsoft says contact lists created in Outlook for Mac are stored on the computer, not the Exchange server, and are available only in that Outlook for Mac installation.
What to do when Groups is missing
If Groups does not appear, check these possible causes:
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| Possible cause | What to check |
|---|---|
| Wrong account type | Microsoft 365 Group features require a qualifying work or school account. Personal Outlook.com accounts have different group functionality. |
| Feature disabled | Your organization may not have enabled Microsoft 365 Groups. |
| Older classic Outlook build | Microsoft says the new Groups experience in classic Outlook requires build 16.0.16714.10000 or later. |
| Mac limitations | Microsoft says the new Groups experience is not yet available in Outlook for Mac. |
| Different interface | Look under More apps, or select Go to Groups from the mailbox folder list. |
If the account and build are correct but Groups is still absent, an administrator may need to enable the feature or adjust group policy.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Important membership limitations
- No nested Microsoft 365 Groups: Microsoft says you cannot add another Microsoft 365 Group or an existing distribution list as a member. Add individual user accounts instead.
- Outlook.com limit: Microsoft Support says an Outlook.com group can contain up to 50 members. People added receive a welcome email with group information and links for accessing or leaving it.
- Mac Microsoft 365 Groups: Microsoft says the new Groups experience is not yet available for Outlook for Mac. Legacy Outlook for Mac supports group creation through File > New > Group. Microsoft says support for legacy Outlook for Mac ends in October 2026, subject to the applicable license.
FAQ
Why can’t I add someone to an Outlook group?
You may not be a group owner, your organization may block guest access, or you may be trying to add an unsupported nested group. For a Microsoft 365 Group, manage membership through the group’s member list or Group Settings, not the Address Book.
Is a Contact Group the same as a Microsoft 365 Group?
No. A Contact Group or contact list is a personal collection of email addresses. A Microsoft 365 Group includes shared conversations, a mailbox, calendar, files, and other collaboration resources.
Can I add a Gmail address to a Microsoft 365 Group?
You can add an external address such as Gmail as a guest when your organization permits guest access. Microsoft says guests receive a welcome email after being added.
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Can I add another Outlook group as a member?
No. Microsoft 365 Group nesting is not supported. Add the individual people instead.
Why does my coworker not see changes to my Contact Group?
A Contact Group is normally stored in your personal Contacts folder. It does not update coworkers’ personal lists unless the Contacts folder is shared.
The Bottom Line
For a shared Microsoft 365 workspace, open Groups, select the group, open its member list, and choose Add members. For a personal email-recipient list, use People > All contact lists or the Contact Group editor in classic Outlook. Choose the right feature first to avoid changing a personal list when you meant to manage shared group membership.
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