Actually, everyone's e-mail is all in one giant file, an Exchange database
file. .edb Where, there are two files, one for private (users mailboxes)
and one for public folders. So, if you lose your .edb files and don't do
backups, a) you should be fired, and b) everyone loses his e-mail. [: But
that's just like any other database system, although some database systems
allow you to span over multiple files, but for all intents and purposes,
it's all just one file.
Ray at work