Calendar Problems

How to Bulk Grant Access to All Organization Calendars in Outlook

Maira Mehtab Sep 21, 2026 869 views

Question details

The organization needs to grant designated users full detail viewing permissions to all employee Outlook calendars without requiring each employee to manually share their calendar.

Product: Microsoft Outlook / Exchange Online
Device & OS: not provided
Scenario: Administering organization-wide calendar permissions efficiently in bulk.
Observed behavior: Manual sharing is highly inefficient for large organizations (e.g., over 300 users), requiring an automated solution like Exchange Online PowerShell.

Before you start

Ensure you have Exchange Administrator privileges and have the Exchange Online PowerShell module installed and connected before executing any bulk scripts.

Solution 1Recommended

Use Exchange Online PowerShell and a CSV File for Bulk Assignment

Ideal for large organizations where manual sharing is impractical, allowing administrators to assign permissions across hundreds of mailboxes automatically.

Using a PowerShell loop alongside a CSV file is the most efficient way to assign bulk calendar permissions. The CSV file should map the target mailboxes and the designated users who need access.

Prepare your CSV file

Create a CSV file with two columns: 'Mailbox' (the employee's email) and 'Delegate' (the user who needs access). Save it to your local drive.

Connect to Exchange Online

Open PowerShell as an Administrator and run the command 'Connect-ExchangeOnline' to authenticate with your administrator credentials.

Execute the PowerShell loop

Import your CSV file and run a loop using the 'Add-MailboxFolderPermission' cmdlet. For example: Import-Csv 'C:\calendars.csv' | ForEach-Object { Add-MailboxFolderPermission -Identity ($_.Mailbox + ':\Calendar') -User $_.Delegate -AccessRights Reviewer }.

Script execution: Running this script will silently apply the permissions. It may take a few minutes depending on the number of users.

Solution 2

Grant Permissions to a Single Mailbox via PowerShell

Useful when an administrator only needs to grant calendar access to a specific user quickly without setting up a CSV file.

Solution 3

Share Calendars Manually within Outlook

Best for individual users or small organizations where users prefer to control their own calendar sharing settings.

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Frequently Asked Questions

Can I bulk share calendars without using PowerShell?

No, bulk assigning calendar permissions across an entire organization requires administrative access and Exchange Online PowerShell. Otherwise, each employee must share their calendar manually through the Outlook interface.

What is the correct AccessRight level for full viewing?

To allow a user to view full calendar details without the ability to modify events, use the 'Reviewer' AccessRights level. If they also need to add or edit meetings, assign the 'Editor' level.

How do I check if the PowerShell bulk script worked?

You can verify the permissions for any specific mailbox by running the 'Get-MailboxFolderPermission -Identity user@domain.com:\Calendar' command in PowerShell. It will list all users who currently have access and their permission levels.

Does Add-MailboxFolderPermission send an email notification to the user?

No, when you use PowerShell to add folder permissions, the target user does not receive a sharing invitation email. The calendar will simply become accessible, and they can open it via the 'Add Calendar' > 'Open Shared Calendar' option in Outlook.

Outlook & Email Problems