How can i determine, how long will exchange cache data. Problem that i have is that i would like to determent estimate time between granting full mailbox access, settings will applay. I know that i can move Active mailbox database between servers, but, that is not helpful, but effect is the same as mount and dismount IS. There is an option to set registry: Mailbox Cache Age Limit, but it is not what i wont to setup. Does these cache apply to mail enabled universal security group, or just to standard non universal group and Users. And does cache affect Public folder database.

1. Some of the questions you have asked for does not simply reply on the exch cache. You have to consider AD replication as well PF replication. 2. For e.g add users to a group, will depend on AD replication, the exch will use the DC/GC to query it's configured DC/GC for that group and get it's membership. 3. So that particular cache does not apply to these groups.Sukh

The cache is two hours by default. However the information is only cached when used. Therefore if you presume that you do not have the permission and then set it before trying to use it, then the new permission may well be used and you can get access immediately. Group Membership lookup is done live. Therefore a common trick is to grant all permissions to groups only, not to users. Then change the membership of the groups as required. That avoids most of the permission cache issues because Exchange knows the group has permission and just needs to look up the membership. As long as domain replication is functioning correctly, that can mean a permission change is active within 15 minutes. The cache applies to all Exchange databases, but it depends on what you are changing. For example if you are changing permissions on a public folder through Outlook then those changes are live the next time the user restarts Outlook. Simon.Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.