Microsoft Exchange Mailbox Merge Program or ExMerge utility is used to extract mailbox data from one Exchange Server to PST and then merges it to another Exchange Server. So this tool is one of the most competent utility for Exchange migration requirements.
Download the ExMerge installer from https://www.microsoft.com/en-us/download/details.aspx?id=2743 and install it.
Select the second option, i.e. Extract or Import (Two-step procedure) and click Next.
Now select the first option, i.e. Extract data from an Exchange Server mailbox and click Next.
ExMerge is a quick and easy solution. Its advantages are:
ExMerge has some limitations as well:
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.
In many scenarios, ExMerge fails to migrate mailboxes to PST files or Exchange server due to the limitations discussed above. Then try using a professional software that can extract full data from corrupt EDB files as well. A popular Exchange Recovery tool for these requirements is Kernel for Exchange Server. It efficiently exports Exchange data to PST files and migrates mailboxes to live Exchange and Office 365. If you are getting error messages after the use of ExMerge, then also you can use Kernel for Exchange Server to access the inaccessible mailboxes.