How to Share a Calendar with a Group in Microsoft 365 Using Mail-Enabled Security Groups

Simplify Calendar Sharing in Microsoft 365 with a Mail-Enabled Security Group

Sharing your work calendar helps everyone stay on the same page. Instead of adding people one by one, you can share with a whole group. Microsoft 365 makes this easy—just use a mail-enabled security group. Here’s how to set it up and share your calendar in minutes.

Step 1: Create a Mail-Enabled Security Group

By default, you can’t share to the built-in “All Users” group. You need a security group that has an email address.

1. Sign in to the Exchange Online Admin Center.
2. Go to Recipients > Groups and click the Mail-enabled security tab.
3. Click Add a group, select Mail-enabled security, then Next.
4. Give the group a clear name and description. Click Next.
5. Under Assign owners, click + and pick who will manage the group. Click Next.
6. Under Add members, click + and select everyone who needs calendar access. Click Next.
7. Enter an email address for the group. You can allow external senders or require owner approval here. Click Next.
8. Review your settings and click Create Group.

Now you have a mail-enabled security group that works like a distribution list and a security group in one.

Step 2: Share Your Calendar in Outlook on the Web

Once your group is set up, share your calendar to it.

1. Open Outlook for Web and switch to Calendar.
2. Click the Settings gear, then View all Outlook settings.
3. Choose Calendar > Shared calendars.
4. Find the calendar you want to share and click Share.
5. Type the name or email address of your security group.
6. Pick a permission level:
   • Can view when I’m busy
   • Can view titles and locations
   • Can view all details
   • Delegate
7. Click Share, then Done.

Members of your security group now see your calendar based on the permission you set. They can add it in their Outlook or mobile calendar apps.

Why This Matters

• Saves Time: No need to update individual permissions when team members change.
• Keeps Everyone In Sync: New hires or role changes automatically get access.
• Simplifies Management: Adjust or revoke access by editing the group instead of each calendar.

Using a mail-enabled security group makes calendar sharing more efficient and error-proof. Set it up today and keep your team coordinated.