Use of Exmerge is plentiful but just getting it ready to roll takes the following three steps typically:
1. Get ExMerge (for Exchange 2003) https://www.microsoft.com/downloads/details.aspx?FamilyID=429163ec-dcdf-47dc-96da-1c12d67327d5&DisplayLang=en
2. Install Exmerge on a PC that has the Exchange admin tools installed (or on an Exchange server itself)
3. Make sure your account has Send As/Receive As Permissions on the Mailbox store you need to work with http://support.microsoft.com/kb/273642/en-us
4. Copy EXCHMEM.DLL (in your Exchange bin directory) to the same place as EXMerge is copied/extracted or you’ll get an error
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