Been having issues with giving permissions to a mailbox thru exchange 2010 when applying it thru the security groups. It takes about 45mins to an hour for the permission to apply. If you give direct access to the mailbox thru exchange - and it gives you permissions straight away. Any suggestions why its slower when giving permission thru a security group?

Hi Slee85, What kind of permission you gona apply with security group ??. permission model in Exchange 2010 is different than its legacy version of exchange which is known as RBAC. Did you try to manage permission by RBAC, If you tell us what exactly you want then we can offer you exact cmdlet. For more detail about RBAC, Please go thru below article. http://www.msexchange.org/articles_tutorials/exchange-server-2010/management-administration/exchange-2010-role-based-access-control-part1.html http://social.technet.microsoft.com/Forums/en/exchangesvradmin/thread/71f0fa54-a927-4a9f-9802-a272b7da54e5Anil

I think this is because Microsoft Exchange Information Store service caches the permissions , so you need to wait updating the cache. To grant the permission immediately, stop and then restart the Microsoft Exchange Information Store service. For Outlook 2007 and Outlook 2010 clients, AutoDiscover services updates the permission automatically. Allow Mailbox Access Manage Send As Permissions for a Mailbox Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

It's likely due to the membership caching mentioned by Jerome. Try this for grins it may or may not help. set-mailbox user -database nameofDB This will refresh the cache per user such as if you upped their limit. However it may or may not work in your case because the store may be caching the group membership so it's more of a backlink cache.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com

Set the cache time to something more aggreable and see if that helps: http://technet.microsoft.com/en-us/library/bb684892(EXCHG.80).aspx I generally set to 20 minutes