HiThis is beginning to frustrate me now. I left the CCR cluster working last night with empty mailbox databases mounted and copy status 'healthy'. I come in this morning and the mailbox stores have 'dismounted', but the copy status is 'healthy.I move the group to reboot the node, then it says it cannot bring the information store service online. I fail it back to the previous node which did have it started, and now I get the same message. I have tried creating exclusions on M: and L: drives which is where Exchange data is, but still no joy. I have reboots as well, these have done nothing.All event viewer reports is:Event Type:ErrorEvent Source:Service Control ManagerEvent Category:NoneEvent ID:7024Date:08/07/2009Time:09:02:12User:N/AComputer:X64EXCHND01Description:The Microsoft Exchange Information Store service terminated with service-specific error 0 (0x0). For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.I can't understand why it is breaking itself, application log shows this:Event Type:ErrorEvent Source:MSExchangeISEvent Category:General Event ID:5000Date:08/07/2009Time:09:02:49User:N/AComputer:X64EXCHND01Description:Unable to initialize the Microsoft Exchange Information Store service. - Error 0x8004010f. For more information, click http://www.microsoft.com/contentredirect.asp. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.and this:Event Type:ErrorEvent Source:MSExchange ClusterEvent Category:ExRes Event ID:1010Date:08/07/2009Time:09:02:49User:N/AComputer:X64EXCHND01Description:The description for Event ID ( 1010 ) in Source ( MSExchange Cluster ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: Exchange Information Store Instance (x64exchvs01), MSExchangeIS.Data:0000: 26 04 00 00 &... Can anyone help please?Thanks

Ok, I should add that I checked the adsiedit permissions as outlined in the Microsoft article, and all were correct.I've since ran /DomainPrep again and it seems to have ironed out the main issue of the service not starting, now I'm going to keep an eye out over the next couple of days and see if it reverts.Thanks