Exchange 2010 (SP1) problems exporting LARGE mailbox to PST

In this case, the customer was having to export mailboxes to PST regularly. With a couple of large mailboxes (both over 5 GB+) the exports were failing.

When attempting to export larger mailboxes to PST using New-MailboxExportRequest, the process would appear to hang and then later fail. The problem was occurring on an intermittent basis, but with two very large mailboxes (5 GB+), the process was having trouble completing at all.

The error code being seen was 0x80040115, which translates to MAPI_E_NETWORK_ERROR. When we see this error, it normally indicates a problem with connection to one of the stores involved in the process.

In this case, the suspicion was that the connection to the PST was the issue, since the PST was being accessed across the network. The PST was being put in a share on the Windows 7 workstation on which the Exchange Management Shell (EMS) was being used to run the command.

The main question that needed to be answered in the process was, "What do we need to do for the PST to be on the same machine that the export process is running on so that it does not need to go over the network?"

To answer that, we needed to look at how the export process runs:

1) In Exchange 2010, your PowerShell operations are remote and are always being executed on an Exchange server; they are not executed on the machine running the Shell, unless you are on the Exchange Server and the shell has connected to the machine you are on. So, even if you are running the EMS on a workstation, it actually connects to one of your Exchange servers, and all commands are executed on that server.

2) The MailboxExportRequest uses the Mailbox Replication Service (MRS), just like a Mailbox Move does. This means that any CAS server running the MRS service, which by default is all CAS servers, could be the CAS server to run the export. We can specify a specific CAS to use with the -mrsserver switch in our New-MailboxExportRequest command.

So, we did 2 things:

1) We created a folder/share on CAS server 1, and gave the Exchange Trusted Subsystem Read/Write access to the share as directed in

2) In our command we specified the new share as our file path, and also specified CAS 1 in the -MRSServer setting in our New-MailboxExportRequest command (i.e. New-MailboxExportRequest -Mailbox user1 -FilePath “\\CAS1\PSTFileShare\user1.pst” -MRSServer

The Mailbox export kicked off and we saw a much higher transfer rate than the customer had seen with any prior exports, and we expected to have a much better chance of success, since the PST was now on the same machine as the MRS and was not going across the network.

The customer later informed me that the export of both very large mailboxes was successful, and was done within hours, whereas it had previously run for more than a day before finally failing.

Comments (20)

  1. Anonymous says:

    -MRSServer part is actully very good trick !!!!

  2. Anonymous says:

    To Recover corrupt or damaged Exchange mailboxes & emails from corrupt, inaccessible, virus attacked MS Exchange(.edb) files data of all Exchange Server.Use this converter utility which can easily convert all EDB file to PST file within seconds.Read more:

  3. Anonymous says:

    Acquire very effective Exchange EDB to PST converter software which perfectly convert Exchange EDB file to PST file along with every emails properties. Using this conversion program you can export Exchange mailbox data to outlook file and successfully
    restore recovered Exchange mailbox data to PST file in few clicks.

    Read More Info :-

  4. Anonymous says:

    If you want to instantly repair corrupted or damaged Exchange EDB file. Then you can easily use a third party Exchange Recovery Tool which provides a better solution to recover all Exchange Mailbox databases within few minutes.So download:

  5. Anonymous says:

    You can easily manage your big PST file by using Split PST tool which is capable of supporting all versions of MS Outlook and Windows OS Platforms. For more information, visit here:-

  6. Anonymous says:

    For the purpose of instant recovery/conversion of Exchange EDB mailbox, try "Exchange Server Edb Recovery" which is much efficient to handle a large corrupt EDB file. It smartly repairs damaged EDB file and renovates it into new Outlook PST format. It
    supports all major EDB file versions up to 2010.

    For any other query visit here:

  7. Anonymous says:

    Perfect Exchange Edb Recovery Tool that can that allow to restore all converted EDB mailbox items into PST format with all respective folders-notes, task, contacts, inbox, outbox, sent items and draft etc. To get its further details follow this link-

  8. Larry Kramer says:

    Thanks for sharing the useful information !
    Recently, we took help from a most recommended third party vendor and successfully exported 15000+ mailboxes into PST files. You may go through this third party utility:


  9. Gioni Xinping says:

    You try most powerful EDB to PST conversion tool which tool easily collect all over EDB files and convert into PST outlook file format with valuable data or file attachments. EDB to PST converter tool now available with free demo version at here:

  10. gionixinping says:

    Use free EDB to PST converter tool to convert EDB mails from corrupt or damaged exchange server, and then convert into PST outlook file format. Read more:

  11. LawrenceWicks says:

    The PST file get corrupt due to Large Size of MS Outlook 2002 and above version for outlook".At this point, Outlook might simply refuse to perform the specific email operation without any notification or error.With the help of split pst file tool solve
    all problem during the sending and receiving email messages. MS Outlook have no inbuilt functions to split a large .pst file into multiple .pst files.

    For more details about this tool please visit here :-

  12. RalphMaldonado says:

    I will suggest you to use this third party software to Split large PST file. With this software you can split multiple pst file in few steps. Software is simple and secure. Mostly MS Outlook users use this software and got good result. Software is supported
    by all MS Outlook version.

    You can visit here for more details :-

  13. suzainsmith says:

    You can utilize freeware EDB to PST software to repair your damage EDB file and view EDB file data in PST file. It simply recovers and converts EDB to PST free with complete data. Through this EDB to PST you are capable to extract email properties, email
    body content, email attachments and email header information etc.

    Read more:

  14. tonyhill20 says:

    I would like to refer more effective software, you can use RecoveryFix for Exchange Server Recovery Tool. This software easy to recover emails, attachments, contacts, calendars, tasks, etc. from corrupt EDB files. It can supported all update version of
    MS Exchange Server 2013 / 2010 / 2007 / 2003 / 2000 and 5.5. To know more detail click here –

  15. RobertGrant says:

    edb to pst converter tool to recover lost edb database and save in to outlook pst file. Software allow to save converted EDB file in to such as formats PST, EML, MSG, RTF, PDF, HTML file format.The software supports exchange server version 2013, 2010,
    2007, 2003, 2000, 5.5 and 5.0. To download :-

  16. amiliaa1 says:

    Exchange Server Recovery is the best and powerful solution to fix all EDB file corruption issues effectively. The software performs accurate recovery of all emails, attachments, contacts, and other mailbox items from corrupt EDB files in a very short span
    of time. Read more information and free download click here and

  17. RobertGrant says:

    Get reliable and secure edb to pst converter also provide to save all corrupt EDB Filethem in different formats like PST, MSG, EML, HTML, TXT and RTF files. For more info, visit here-

  18. yanjackson says:

    EDB file converter is the best and relvant solution for recovery EDB file and migration EDB to PST file without any delay. All users can safely export OST email to PST with whole OST email Meta data. Program has great capability to run all versions of
    Exchange file with easy conversion of EDB file into multiple formats.

    Read More:

  19. yanjackson says:

    EDB file converter is the best and relvant solution for recovery EDB file and migration EDB to PST file without any delay. All users can safely export EDB email to PST with whole EDB email Meta data. Program has great capability to run all versions of
    Exchange file with easy conversion of EDB file into multiple formats.

    Read More:

  20. Frank Norris says:

    EDB to PST convetrer is one such best solution that effectively recovers corrupt EDB files and recovers entire email data along with all email items such as email attachments, contacts, notes, calendar, tasks, deleted items etc. Read more at: or