Problem: Information store won't come online, and event log has MSExchangeIS 9564
Cause: Antivirus software is causing the problem, in this case
Solution: Disable AV from register and restart the information store service
Information store won't mount, and event log will have the following error Event ID: 9564
After performing several tests, and disabling most of the services have figured out the AV software is causing the issue. Disabling AV from register did the trick
Set enabled to 0 to disable the AV
Event Type: Error
Event Source: MSExchangeIS
Event Category: General
Event ID: 9564
Time: 9:12:34 AM
Error 0xffffffff starting the Microsoft Exchange Information Store.
Failed to init VSERVER.
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