Exchange Mailbox Stores must mount at startup.

From Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide

Associated with: CCI-001094

SV-95387r1_rule Exchange Mailbox Stores must mount at startup.

Vulnerability discussion

Administrator responsibilities include the ability to react to unplanned maintenance tasks or emergency situations that may require Mailbox data manipulation. Occasionally, there may be a need to start the server with "unmounted" data stores if manual maintenance is being performed on them. Failure to uncheck the "do not mount on startup" condition will result in unavailability of mail services. Correct configuration of this control will prevent unplanned outages due to being enabled. When maintenance is being performed, care should be taken to clear the check box upon task completion so mail stores are available to users (unmounted mailbox stores are not available to users).

Check content

Open the Exchange Management Shell and enter the following command: Get-MailboxDatabase | Select Name, Identity, MountAtStartup If the value of "MountAtStartup" is not set to "True", this is a finding.

Fix text

Open the Exchange Management Shell and enter the following command: Set-MailboxDatabase -Identity <'IdentityName'> -MountAtStartup $true Note: The value must be in single quotes.

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