How can I change the drive letter used for the Exchange Installable File System (ExIFS)?

A. If you want to use a letter other than M for ExIFS, perform the following steps on the Exchange server:

  1. Start regedit.exe.
  2. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EXIFS\Parameters.
  3. Double-click DriveLetter (or create a String type value named DriveLetter, if it doesn't exist).
  4. Set DriveLetter to the desired drive letter. Click OK.
  5. Close regedit.
  6. Reboot the Exchange server.
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