Conversations in a Microsoft 365 Group in Outlook happen in the shared inbox for the group. You can read and reply to messages, and members can easily search or scroll back through the message history to get caught up on what's been discussed before. Members who follow the Group in Outlook also receive conversations in their personal inbox.
Here are a few important things to remember about sending emails to a Group in Outlook:
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Anyone in your organization can start a group conversation.
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For a public group, anyone in your organization can read and respond to the group's conversations.
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For a private group, only group members can participate in the conversation.
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If you delete group email from your personal inbox, the email can still be found in the group mailbox.
Looking for information on contact lists? Check out Create, edit, or delete a contact list (or contact group) in Outlook.
Note: These features are only available to individuals using a work or school account with a qualifying Microsoft 365 subscription.
Send an email to a Group in new Outlook
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From the navigation bar select
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Select New mail.
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In the To field, enter your group's email address.
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Add a subject and type your message.
If guests are part of your group, you might see a message that some recipients are outside of your organization.
If the admin has restricted guest access to group conversations and calendar invitations, you'll see a message telling you that group members outside your organization won't receive the message.
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Select Send.
Tip: You can also send an email to a group from your personal inbox. Just add the group's alias in the To line in your email.
Reply to an email to a Group in new Outlook
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From the navigation bar select
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Select the email.
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At the top of the reading pane, select Reply
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Enter your message, and then select Send.
Forward an email from a Group in new Outlook
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From the navigation bar select
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Select a message from the group mailbox.
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And at the top of the reading pane, select Forward.
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Type the recipients' email addresses and your message to them.
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Select Send.
Delete a conversation for everyone in a Group in new Outlook
Only group owners can delete conversations for everyone. How do I know if I'm a group owner?
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From the navigation bar select
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In the message list, select and hold (or right-click) the message you want to delete.
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Select Delete.
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Select OK to confirm.
Receive a copy of email you send to a Group in new Outlook
If you're a member of group and follow the group in your inbox, you can choose to receive a copy of messages you send to a group.
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At the top of the page, select Settings
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Select the check box for Send me a copy of email I send to a group.
Note: These features are only available to individuals using a work or school account with a qualifying Microsoft 365 subscription.
Send an email to a Group in classic Outlook
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In the navigation pane, under Groups, select your group.
Note: Due to a change in the way unread message counts in Groups are calculated, you may see the unread count next to the group name suddenly increase dramatically. To reset that back to zero just right-click on each affected group and select "Mark all as read". It shouldn't reoccur and unread counts should behave as expected from that point forward.
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From the ribbon, select New Email.
Notice the group's alias is automatically added in the To line.
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Type your message and select Send. All the members of the group will receive your email.
Tip: You can also send an email to a group from your personal inbox. Just add the group's alias in the To line in your email.
Reply to an email to a Group in classic Outlook
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To reply only to the sender, right-click a message and select Reply.
Your message is sent only to that person, and not the group.
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To reply to the group, either right-click the message and choose Reply all, or type in the Add a message box in the reading pane and select Send.
Tip: If you like the message, select the 
Forward an email from a Group in classic Outlook
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Open or select the message from the reading pane.
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From the ribbon, select Forward.
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Type the recipients' email addresses and your message to them.
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Select Send.
Note: These features are only available to individuals using a work or school account with a qualifying Microsoft 365 subscription.
Send an email to a Group in Outlook on the web
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From the navigation bar select
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Select New mail.
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Add a subject and type your message.
If guests are part of your group, you might see a message that some recipients are outside of your organization.
If the admin has restricted guest access to group conversations and calendar invitations, you'll see a message telling you that group members outside your organization won't receive the message.
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Select Send.
Tip: You can also send an email to a group from your personal inbox. Just add the group's alias in the To line in your email.
Reply to an email to a Group in Outlook on the web
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From the navigation bar select
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Select the email.
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At the top of the reading pane, select Reply
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Enter your message, and then select Send.
Tip: If you like a message, select the 
Forward an email from a Group in Outlook on the web
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From the navigation bar select
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Select a message from the group mailbox.
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And at the top of the reading pane, select Forward.
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Type the recipients' email addresses and your message to them.
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Select Send.
Delete a conversation for everyone in a Group in new Outlook
Only group owners can delete conversations for everyone. How do I know if I'm a group owner?
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From the navigation bar select
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In the message list, select and hold (or right-click) the message you want to delete.
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Select Delete.
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Select OK to confirm.
Receive a copy of email you send to a Group in Outlook on the web
If you're a member of group and follow the group in your inbox, you can choose to receive a copy of messages you send to a group.
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At the top of the page, select Settings
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Select the check box for Send me a copy of email I send to a group.
Send an email to an Outlook.com group
Note: By default, only group members can send email to an Outlook.com group. To allow non-members to send email to an Outlook.com group, you'll need to add the non-members as trusted senders.
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From the navigation bar select
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Select Send email.
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Add a subject and type your message.
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Select Send.
Reply to a message sent to an Outlook.com group
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From the navigation bar select
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In your message list, choose the message that you want to reply to.
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Select Reply
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Type your response, and then select Send.
Forward an email to an Outlook.com group
When you forward a message that has an attachment, the forwarded message will include the attachment.
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From the navigation bar select
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In the message list, choose the message that you want to forward.
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Select Forward.
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On the To line, enter the name of the group or the group email address.
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Type your message, and then select Send.
See also
Add, edit, or remove Group members in Outlook
Adding guests to Microsoft 365 Groups
Join, leave, or follow Groups in Outlook
Send an email to a Group in Outlook
Schedule an event on a Group calendar in Outlook
Use shared files with your Microsoft 365 Group in Outlook
Edit or delete a Group in Outlook
