I have problem with assign AD Security Group to have FULL access to Shared Mailbox. What i did is: 1. Create a shared mailbox 2. Create a universal security group 3. Add-MailboxPermission -Identity <Shared Mailbox name> -AccessRight Full Access 4. Then I add my self to Universal security group and open my outlook and add addtional mailbox for Shared Mailbox. Problem is I unable to expend it says, don't have a permission but in reality permission had been granted. I try to add my Account directly to have FULLAccess to the Shared Mailbox, then I'm able to expend it. if I have 100 users, do I have need to added 100 AD users to Shared Mailbox since using AD Security will not work. I had read: http://community.spiceworks.com/how_to/show/198 http://knicksmith.blogspot.com/2007/03/exchange-2007-and-shared-mailboxes.html http://social.technet.microsoft.com/Forums/en-US/exchangesvradmin/thread/62906bd2-914f-4b32-97c9-4412b746acdd I just follow their steps but still able to use AD Security group to assign permssion to Shared Mailbox, please advice where do i miss

The root cause is "TIME", just left 24 hours then check again this morning, I'm able to expand the shared mailbox