Event ID - 1012

Event Id1012
DescriptionExchange Information Store Instance: The RPC call to the service to take the resource offline failed.
Event InformationAccording to Microsoft:
This problem occurs if the RootVer registry value is invalid.
If the computer is running the Microsoft .NET Framework 1.1, set the RootVer registry value to 1.1.4322.0. To do this, follow these steps:
1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following key:
3. Double-click the RootVer value, type 1.1.4322.0 in the Value data box, and then click OK.
4. Quit Registry Editor.
Reference LinksThe Microsoft Exchange System Attendant service may not come online if the RootVer registry value is invalid on a server that is running Exchange Server 2003

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