How do I apply special group Exchange calendar permissions?

Question

I've got an Active Directory Security Group with a number of people in it. I'd like anyone in that group to be able to update each other's calendars. How do I go about telling Exchange (2010) to do this?

Trying this:

Add-MailboxFolderPermission jimbob:\Calendar -User coolgroup -AccessRights Editor

Results in:

The specified mailbox "jimbob" doesn't exist.
    + CategoryInfo          : NotSpecified: (0:Int32) [Add-MailboxFolderPermission], ManagementObjectNotFoundException
    + FullyQualifiedErrorId : 182E7303,Microsoft.Exchange.Management.StoreTasks.AddMailboxFolderPermission

I've tried it with and without "-Identity", with full e-mail address, and by common name. All do exactly the same thing.

Answer 1

PowerShell one-liner:

Get-DistributionGroupMember groupName | Foreach-Object {
    Add-MailboxFolderPermission ($_.Alias + ":\Calendar") -User groupName -AccessRights Editor
}

Note that this applies the permission to the members currently in the group. Therefore:

• If you add anyone to the list, you'll need to run the command again.
• If you remove anyone, you'll need to manually remove the permission.

Answer 2

For each user, go to the security permissions of the calendar by right clicking it and going to "properties> permissions" in Outlook and add the group. Grant the group the permissions as necessary.