Hi Experts, something odd happened to my server and the Exchange Information Store service is missing, I check regedit and the entire key MSExchangeIS (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS) is missing. The store.exe file is still there and the physical files look to be intact.
As a result all email services are down and the database status is "Dismounted" I have access to Exhange Shell and the Management Console
Is there a way I can reinstate/reinstall the service? I am running Small Business 2011
If you have no system state backup you can restore then you could try repairing the Exchange roles as per the following technet article:
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