Exchange mailbox stores must mount at startup.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-259674	EX19-MB-000121	SV-259674r961152_rule		Low

Description
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).

Description

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).

STIG	Date
Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide	2024-06-10

Details

Check Text ( C-63413r942334_chk )
Open the Exchange Management Shell and enter the following command: Get-MailboxDatabase \| Select-Object -Property Name, Identity, MountAtStartup If the value of "MountAtStartup" is not set to "True", this is a finding.

Fix Text (F-63321r942335_fix)
Open the Exchange Management Shell and enter the following command: Set-MailboxDatabase -Identity <'IdentityName'> -MountAtStartup $true Note: The value must be in quotes.