The Microsoft Exchange Mailbox Merge Program (Exmerge.exe) enables an Exchange Server administrator to extract data from mailboxes on an Exchange Server computer and then merge this data into the same mailboxes on another computer that is running Exchange Server.

Common kmssnapin.dll error messages:
- "Windows could not start because the following file is missing or corrupt: Windows root\system32\Kmssnapin.dl. Please re-install a copy of the above file."
- "Winnt_root>\System32\Kmssnapin.dl missing or corrupt: Please re-install a copy of the above file."
- "Cannot find \Windows\System32\Kmssnapin.dl."
- "Cannot find Kmssnapin.dl."
- "A required .DLL file, Kmssnapin.dl was not found."
- "Program requires the file 'Kmssnapin.dl' to run. Run Setup again to assure proper installation."

How to install KMSSNAPIN.DLL file?

1. Press Start and select Run
2. Type CMD and press Enter (or if you use Windows ME, type COMMAND)
3. Type regsvr32 KMSSNAPIN.DLL and press Enter
4. In the end, you should receive a message saying that your file was successfully installed or uninstalled.