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The Microsoft Exchange Mailbox Merge Program, also known as the ExMerge utility, plays a pivotal role in seamlessly transferring mailbox data from one Exchange Server to a PST file, subsequently facilitating its integration into another Exchange Server. This versatile tool stands as an indispensable resource for meeting Exchange migration demands with utmost efficiency and reliability.

How to use ExMerge utility?

ExMerge is an Exchange Server utility to extract and merge mailbox data. Follow the below steps to configure settings, select source and target mailboxes, then execute to transfer data between them.

Download ExMerge Tool and follow the steps given below:
  1. Open ExMerge (from Exchsrvr\bin folder in Program Files).
  2. A window with following options will appear in front of you:
    • Extract and Import (One step procedure)
    • Extract or Import (Two-step procedure)

    Select the second option, i.e. Extract or Import (Two-step procedure) and click Next.

  3. Another window with following options will appear:
    • Extract data from an Exchange Server mailbox
    • Import data into an Exchange Server mailbox

    Now select the first option, i.e. Extract data from an Exchange Server mailbox and click Next.

  4. Now give the required information about the source Exchange Server.
  5. A window named Database Selection will appear. Select the required database.
  6. Select the mailboxes from the list of mailboxes available on the server and click Next.
  7. Next, specify the target directory, browse to store the migrated PST file and click Next.
  8. Wait for the migration process to complete. A message will pop up when the operation completes. At the end click Finish.
Benefits of ExMerge Utility

ExMerge is a quick and easy solution. Its advantages are:

  • Can be used for single, multiple or all the mailboxes.
  • Users can back up single mailbox instead of entire database.
Shortcomings of ExMerge

ExMerge has some limitations as well:

  • Cannot recover mailboxes above 2 GB data.
  • Cannot operate on a corrupt Exchange server.
  • Does not support public folders.
  • Can cause occasional errors
Error after Using Exmerge.exe

At times you may get an error while using ExMerge:

"Error configuring message service (MSPST MS) (MAPI_E_EXTENDED_ERROR) (CmapiSession::CreateEMSPSTProfile).
Error opening message store (MSEMS). Verify that the Microsoft Exchange Information Store service is running and that you have the correct permissions to log on. (0×8004011d)."

This can be due to incompatibility issues, the modified format of Outlook PST, PST privilege issues, corruption, etc. Sometimes the entire Exchange database can get corrupt due to the issues in ExMerge use.

ExMerge utility alternatives

In numerous scenarios, ExMerge encounters challenges when attempting to migrate mailboxes to PST files or the Exchange server, largely attributed to the limitations we’ve previously discussed. In such instances, it is advisable to consider employing a dedicated professional software solution capable of extracting comprehensive data from corrupted EDB files. One particularly well-regarded option for Exchange Recovery is the Kernel for Exchange Server tool. This versatile tool excels in efficiently exporting Exchange data to PST files and seamlessly migrating mailboxes to both live Exchange and Office 365 environments. In cases where you encounter error messages during or after using ExMerge, Kernel for Exchange Server can prove invaluable in gaining access to otherwise inaccessible mailboxes.

Kernel for Exchange Server