Dear experts, I hope you can help us. We had a Exchange 2010 server working (unique server in our domain) and we attempted to apply SP1. It crashed during install and so we have restored the Exchange server from a previous image. After the restore, the Information Store won't start and digging further, it seems the DomainPrep for 2010 SP1 was applied to our domain and so the signature does not correspond anymore. What can we do to go back to a clean state? We are unable to run the SP1 install and so I was wondering if there was a way to reapply the 2010 (no-SP1) domain prep? Any other suggestion? Thanks in advance. Best Regards, Eric

what are the events generated ?

Event ID 5000 from MSExchange IS Unable to initialize Microsoft Exchange Information Store - Error 0x8004010f. (translated from French) I have tried the suggestion from the KB on this error and with ADSIEdit, the permissions are as they should be. However the Best Practice analyzer reports that Domain has unknown Exchange signature 13040 (the one applied from SP1 install attempt, so out of sync with the restore of non-SP1 version)

Did you gave the Exchange computer Account full permission on the Exchange object in the ADSIEDIT. Also while giving permission please make sure it is set to apply to child objects. Jasjit Singh Dhindsa | ITIL v3 | IASA Foundation Certified | MCITP:Exchange 2010 | Exchange 2007 | MCTS:OCS 2007 | Exchange 2010 | Exchange 2007 | MCSA:Messaging | Security | MCSE:Messaging | Security | MCP

Yes, all permissions are given, but from what it seems the Active Directory schema is wrong because the setup has prepared the domain for 2010 SP1 and I have restored 2010. So now I cannot start IS to even try to reapply SP1 (unless there is a way to force install without the IS service running) Which is why I hope there is a step-by-step procedure to be able to reapply the domain prep for the 2010 (non-SP1) version.Is there such a way? Should I give up?

As i understand the Exchange system is on the Exchange 2010 RTM Version and your AD is at version 2010 SP1. The exchange checks the domain version from the attribute objectVersion on the Exchange System Objects in the domain partition in AD. This is i would try but i would take a complete system backup and Active Directory backup, I would open ADSIEDIT and export the configuration and save it and then change the attribute objectVersion on the Exchange System Objects to value 12639.Jasjit Singh Dhindsa | ITIL v3 | IASA Foundation Certified | MCITP:Exchange 2010 | Exchange 2007 | MCTS:OCS 2007 | Exchange 2010 | Exchange 2007 | MCSA:Messaging | Security | MCSE:Messaging | Security

Thanks. Good suggestion. I just tried it. Still the same thing.

Does ExBPA gives any error this time ?Jasjit Singh Dhindsa | ITIL v3 | IASA Foundation Certified | MCITP:Exchange 2010 | Exchange 2007 | MCTS:OCS 2007 | Exchange 2010 | Exchange 2007 | MCSA:Messaging | Security | MCSE:Messaging | Security

No. Not anymore. But MSExchangeIS still won't start. Same error message.

Since the way we try to idenity the Exchange OrganizationDomain version is resolved now, So your setup will also think about it being the RTM version should allow the Domain prep again. So go ahead and run the Exchange server 2010 RTM DomainprepJasjit Singh Dhindsa | ITIL v3 | IASA Foundation Certified | MCITP:Exchange 2010 | Exchange 2007 | MCTS:OCS 2007 | Exchange 2010 | Exchange 2007 | MCSA:Messaging | Security | MCSE:Messaging | Security

Since the way we try to idenity the Exchange OrganizationDomain version is resolved now, So your setup will also think about it being the RTM version should allow the Domain prep again. So go ahead and run the Exchange server 2010 RTM PrepareAD Jasjit Singh Dhindsa | ITIL v3 | IASA Foundation Certified | MCITP:Exchange 2010 | Exchange 2007 | MCTS:OCS 2007 | Exchange 2010 | Exchange 2007 | MCSA:Messaging | Security | MCSE:Messaging | Security

Tried to run /PrepareAD from original 2010 install and it failed. I am now considering rebuilding server from scratch, hoping I can reuse the mailbox database.

What error did it gave ?Jasjit Singh Dhindsa | ITIL v3 | IASA Foundation Certified | MCITP:Exchange 2010 | Exchange 2007 | MCTS:OCS 2007 | Exchange 2010 | Exchange 2007 | MCSA:Messaging | Security | MCSE:Messaging | Security

The error was that the server was in invalid state and that I could only run setup /m:RecoverServer (which also failed at the point of loading installation files) Thanks for the help. I am now reformatting and reinstalling the server (but this time directly with Ex2k10SP1)...

The error was that the server was in invalid state and that I could only run setup /m:RecoverServer (which also failed at the point of loading installation files) Thanks for the help. I am now reformatting and reinstalling the server (but this time directly with Ex2k10SP1)...