calendar permissions to a security group

Question

We need to give our secreterial permissions to all employee calendars to add/change/delete the appointments.
With powershel we tried the following:

Get-mailbox | ForEach-Object { Set-MailboxFolderPermission -Identity $_":\Calendar" -User XXXX -AccessRights EditAllItems }

But that gave errors because the identity will be set to the "name" vallue instead of the emailaddress.

Can someone help us please?
Better yet it would be great to set these permissions company wide by default to a security group

Answer 1

The proper way to do things would be to get both the mailbox and folder's ids, as "Calendar" is only valid for users with language preference set to English. So something like this:

$calendars = Get-Mailbox -RecipientTypeDetails UserMailbox | Get-MailboxFolderStatistics -FolderScope Calendar | ? {$_.FolderType -eq "Calendar"} | select @{n="Identity"; e={$_.Identity.ToString().Replace("\",":\")}}

$calendars | % {Add-MailboxFolderPermission -Identity $_.Identity -User XXXX -AccessRights Editor} 

You can provide a (mail-enabled) security group for the User value. Also double-check the permissions you'd want added, as EditAllItems does not allow you to create new items.