Exchange 2019 - stuck export to PST request

Susan Dodds 186 Reputation points

Exchange 2019.

Did an export to PST on a large mailbox (larger than 50gb).

PST file grew to larger than the mailbox size, mailbox request said it was only at 11% in powershell.

Did a cancel on the PST export in powershell. PST export no longer shows up in powershell.

Trying to move the PST file it created. Unable to move file since it is "open in SYSTEM".

How do I resolve the "open in SYSTEM" and make it so future exports don't get stuck?


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. Susan Dodds 186 Reputation points

    The "open in SYSTEM" seems to have resolved itself but I would still like to know the best way to do a pst export without it failing for larger mailboxes.

  2. Joyce Shen - MSFT 16,651 Reputation points

    Hi @Susan Dodds

    Regarding your concern, the PST file grew to larger than the mailbox size, that's because Exported .pst includes deleted items yet to get purged. Below thread discussed the similar question:
    Export Mailbox PST larger than mailbox

    And the best practice, if you export a large mailbox using “New-MailboxExportRequest” on server side, we suggest you use multiple export requests with special folders by a filter.

    For example use
    The ExcludeDumpster switch specifies whether to exclude the Recoverable Items folder. You don't need to specify a value with this switch.
    The ExcludeFolders parameter specifies the list of folders to exclude during the export.
    The IncludeFolders parameter specifies the list of folders to include during the export.

    A related thread here for your reference as well: Mailbox Export Request to PST is 94% complete, 123/130GB. It's ran for 6 days, now it seems to be stuck 'InProgress' - what are my options?
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