all mail disapear

ramin sa 256 Reputation points
2021-04-17T13:57:48.193+00:00

Hi dear expert

after install kb5001779 all inbox,sent and... mail in some user mailbox disappear

please give me hand to fix issue

Tank you in advance

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Manu Philip 14,036 Reputation points Microsoft MVP
    2021-04-17T16:14:34.607+00:00

    Check the missing emails from outlook are appeared in other mail clients (owa, mobile etc.). If so, try recreating the profile in outlook and check the missing mails are back

  2. KyleXu-MSFT 25,611 Reputation points
    2021-04-19T06:02:26.143+00:00

    @ramin sa

    First, there doesn't exist any feedback about that this KB will cause email missing. It isn't an issue that caused by this Security Update,

    Use command below to check whether there exist emails in this mailbox Inbox and Sent Items: 

    Get-MailboxFolderStatistics User1 | ft Identity,FolderAndSubfolderSize

    88955-qa-kyle-13-40-56.png

    If emails exist in this mailbox, you can try to check from OWA or create a new profile. You can also use New-MailboxExportRequest to export emails from this mailbox.

    If there real doesn't exist emails in this mailbox inbox, try to check whether there exist emails in "Deletions" or "Purges", if there exist emails in those folders, it means those email was delete by mistake. You can follow this picture below to recover those emails:
    88971-qa-kyle-14-00-11.png

    If there doesn't exist emails in those folders, you will cannot find and recover those emails.

    If the response is helpful, please click "Accept Answer" and upvote it.
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