Missing email during Exchange mailbox dismount ?


I'm running Exchange Server 2013 SP1 that was losing its 1.9 TB Database disk for 2 hours, and then back online again all in a sudden.

So the timing is like:

9:00 PM - 9:30 PM, I am doing my change to delete the oversized Mail.que:
1.  Go to services.msc and Pause the Microsoft Exchange Transport service.
2.  Run “Get-Queue | ft -AutoSize” and ensure all pending messages are clearing out to be very minimal under 10.
3.  Stop the Microsoft Exchange Transport service
4.  Set Microsoft Exchange Transport service to "Disabled"
5.  Rename mail.queue file
6.  Set Microsoft Exchange Transport service to "Automatic"
7.  Reboot the Exchange server
8. Run “Get-Queue | ft -AutoSize” and ensure all pending messages are clearing out.

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after the reboot, the Windows Server is rebooting itself again, but then this time its worst, the D:\ drive where all of the Exchange mailbox DB went missing due to the D:\ drive has become RAW instead of NTFS for about 2-2.5 hours.

11:45 PM yesterday, the D:\ drive is mysteriously back online again as NTFS drive, all emails are flowing back as normal.

But then I've got some users more than half reporting that they are missing their yesterday's email even before the maintenance window yesterday at 9:00 PM ?

The email today is working fine from everyone, but some of my users did lose their yesterday emails?

Looking through Exchange Transaction logs, I can see some emails within the outage window:

Timestamp      EventId      Source
14/06/2017 21:00      DELIVER      STOREDRIVER
14/06/2017 23:05      DUPLICATEDELIVER      STOREDRIVER
14/06/2017 21:22      RECEIVE      STOREDRIVER
14/06/2017 21:22      SUBMIT      STOREDRIVER
14/06/2017 21:00      EXPAND      ROUTING
14/06/2017 21:00      AGENTINFO      AGENT
14/06/2017 21:00      TRANSFER      ROUTING
14/06/2017 21:00      SEND      SMTP
14/06/2017 21:05      HAREDIRECT      SMTP
14/06/2017 21:05      RECEIVE      SMTP
14/06/2017 22:00      HARECEIVE      SMTP
14/06/2017 23:06      HADISCARD      SMTP
14/06/2017 21:20      HAREDIRECTFAIL      SMTP
14/06/2017 21:43      DEFER      SMTP
14/06/2017 23:04      TRANSFER      AGENT

but how come they are not appearing in the user's mailbox?

Any help would be greatly appreciated.

LVL 13
Senior IT System EngineerSenior Systems EngineerAsked:
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Sunil ChauhanConsultant Commented:
i  suspect missing email could still in the mail.que, do you have the file backup?
Senior IT System EngineerSenior Systems EngineerAuthor Commented:
I still got the file.
But how to replay it to the mailbox with no downtime ?
Sunil ChauhanConsultant Commented:
i woud suggest one way could be, you build a new test server, take the file there reply the mail.que, export the msg stuck in queue and then put them back in pickup directory.

I know its mess but this what I could suggest, if there is a big data loss i would recommend reach out the premium ms support for recommendations.

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Senior IT System EngineerSenior Systems EngineerAuthor Commented:
There is no way to recover back the missing email.
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