View and Change Exchange Mailbox Calendar Permissions with Powershell

Permissions for mailbox calendars are managed separately to the actual mailbox permissions. You can use the below cmdlets in powershell to view and add/edit the permissions on a users mailbox.

To view current calendar permissions on a mailbox

get-mailboxfolderpermission -identity "name:\Calendar" | ft

To add new calendar permissions on a mailbox

add-mailboxpermission -identity "name:\Calendar" -User "usertogetaccess" -AccessRights "Accesslevel"

To modify an existing calendar permissions entry on a mailbox

set-mailboxfolderpermission -identity "name:\Calendar" -User "usertogetaccess" -AccessRights "Accesslevel"

To remove an existing calendar permissions entry on a mailbox

remove-mailboxpermission -identity "name:\Calendar" -User "usertogetaccess" -AccessRights "Accesslevel"

Name = the display name alias or email address you are setting the calendar permissions ON
Usertogetaccess = the display name, alias or email address you are granting calendar permissions TO
Accesslevel = the level of access to be granted. The available options are:

• Owner
• Publishing Editor
• Editor
• Publishing Author
• Author
• Nonediting Author
• Review
• Contributor
• Free/Busy Time
• None