Get list of Bookings:
(Get-Mailbox -RecipientTypeDetails SchedulingMailbox -ResultSize:Unlimited).PrimarySmtpAddress
Get associated user(s) with Bookings calendar:
Get-Mailbox -RecipientTypeDetails SchedulingMailbox | Get-MailboxPermission | Select-Object Identity,User,AccessRights | Where-Object {($_.user -like '*@*')}
Remove Bookings address list from global address list (gal):
Set-Mailbox -Identity "BookingsEmailAddress" -HiddenFromAddressListsEnabled $True
Adding a user to a Booking as an Admin:
Add-MailboxPermission -Identity MyBooking@live.xxx.com -User joeUser@xxx.com -AccessRights FullAccess -InheritanceType All Add-RecipientPermission -Identity MyBooking@live.xxx.com -Trustee joeUser@xxx.com -AccessRights SendAs -Confirm:$false