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How to Migrate Outlook Calendar Permissions Between Office 365 Tenants

Jun 11, 2020 by Mike Weaver

IT pro sat at computer, migrating Outlook calendar permissions

In this post, we are going to cover migrating Outlook Calendar Permissions between Office 365 tenants.

Over the years, this has gotten easier and easier for users to control. The specialized share calendar wizard is now easy to use. In terms of migration, though, this can cause other problems.

Screen shot showing the Shared Calendar window in Outlook.

If you are looking for more detail on the other types of Exchange Mailbox Permissions, check them out here.

In this post, we will look at the specifics of Outlook Calendar Permissions in more detail.

If It Isn’t On My Calendar, I Simply Don’t Do It

Outlook Calendars run our work lives. For many, it keeps corporate order and is a universal method of basic collaboration. It is perhaps the highest impact item during a failed or delayed migration. Simply put, just like trains don’t run on time without a schedule, neither do organizations.

With this importance, many of us share our calendars, with varying levels of access, to our close colleagues. This allows someone to see what is ‘moveable’, answer where they are, and countless other scenarios.

What are Calendar Permissions?

From an Exchange Perspective, Calendar Permissions are folder level permissions on the top-level Calendar folder. This is by far the most used Folder Sharing practice in Exchange. The other use cases are not as common and more complex, and you can read my article on migrating Outlook Folder Permissions here.

How To Migrate Calendar Permissions?

The good news is that most of these permissions can be collected and migrated with some simple commands. The same cannot be said for Delegate Permissions, which you can read my rant on here.

As for Outlook Calendar Permissions, you can collect most settings using the Get-MailboxFolderPermission commands. You will need to manipulate the data in order to re-apply it in the target, but it is doable.

Notes on Free/Busy

Free/Busy information is another critical aspect of collaboration. This allows people to only see if someone is free, has an appointment, or outside of their working hours. This data can be shared externally using federation options. During an Office 365 tenant migration project, you should review what companies the source company is sharing with and work to recreate these where appropriate.

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