Every encounter a flaky email template? Usually when I do, I need to create a brand new database from scratch, and copy in all of the documents from the original. However, this is quite tedious to re-sync Folders. And, you can only copy so many documents at a time using Edit Copy - Edit Paste.
The Database Migration Utility allows you to select a source, a destination, and if the destination database doesn't already exit - the template to use for the new database. It then copies all of the documents out of the source, puts them into the destination, rebuilds folders, and preserves Response relationships.
I use this in times when File-Database-Copy, Refresh Design, and Replace Design all fail to correct an corrpution issue in the mail template, or when I cannot get the database to "compact" correctly (the database is using way too much disk space, but there aren't many documents in the database).
Can be used with any database, but I usually use it for mail. You can also use it to "combine" data from two database, again preserving folders and response documents.