In Exchange2010, I created a shared mailbox yesterday, then granted several groups and individuals "full access permissions" to the Shared mailbox.
When I arrived at work this morning and looked at the permissions, all the permissions I had assigned were gone, except for a single individual.
I re-applied the same permissions and checked them an hour later and they were gone again. I thought it may be related to the groups, so I selected several individuals and gave them Full Access Permissions to the Shared Mailbox. I checked that some time later to discover that several individuals were missing again..
What might cause this to happen