Calendar Problems

How to Share a Microsoft 365 Calendar with More Than 200 Users

Huda Qurayshi Oct 10, 2026 868 views

Question details

The user needs a time-efficient method to assign calendar viewing or editing permissions to hundreds of users simultaneously.

How to Share a Calendar with More Than 200 Users in Microsoft 365

Product: Microsoft 365
Device & OS: not provided
Scenario: Managing calendar permissions in bulk for a large organization, department, or enterprise team.
Observed behavior: Adding users individually to a shared calendar is too manual and time-consuming, requiring a centralized bulk-management solution.

Before you start

Ensure you have Microsoft 365 admin credentials, as creating and managing security groups requires administrator privileges.

Solution 1Recommended

Use a Security Group to Assign Calendar Permissions

Creating a security group allows you to manage bulk permissions centrally, saving significant time when dealing with hundreds of users.

Instead of assigning permissions one by one, Microsoft 365 allows you to grant calendar access to a single security group. Any user added to this group automatically inherits the calendar permissions.

Access the Admin Center

Create a Security Group

Navigate to 'Teams & groups' on the left sidebar and select 'Active teams and groups'. Click on 'Add a group', choose 'Security' as the group type, and complete the setup by naming the group.

Add Users to the Group

Once the group is created, click on its name to open the details pane. Go to the 'Members' tab, click 'View all and manage members', and add your 200+ users to the group.

Share the Calendar

Open your calendar application (such as Outlook), right-click the calendar you want to share, select 'Sharing Permissions', and add the newly created security group with the desired permission level.

Use a Security Group to Assign Calendar Permissions

Centralized Management: Future changes to calendar access can be handled simply by adding or removing users from this security group in the admin center.

Solution 2

Set Up a Microsoft 365 Group Calendar

Alternatively, you can use a Microsoft 365 Group to automatically provision a shared workspace that includes a dedicated shared calendar for all members.

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Frequently Asked Questions

Can I add a distribution list to a shared calendar instead of a security group?

No, standard distribution lists cannot be used to assign calendar permissions in Microsoft 365. You must use a mail-enabled security group or a standard security group to successfully grant calendar access.

Will users receive an email notification when I share the calendar with the security group?

Yes, by default, when you share a calendar with a security group from Outlook, an invitation email is sent to the group. This allows members to easily click and add the shared calendar to their own view.

Is there a limit to how many users can be in a Microsoft 365 security group?

Microsoft 365 security groups can support up to hundreds of thousands of users, which will easily accommodate your need to share a calendar with 200 or more people.

How do I remove calendar access for a specific user later?

To revoke access, simply remove the specific user from the security group in the Microsoft 365 admin center. Their access to the shared calendar will be automatically removed without affecting the rest of the group members.

Outlook & Email Problems