Maildir conversions
	- cyrus2courier - despite
		the name, this tool also supports dovecot
 
	- mb2md -
		convert mbox folders to maildir.  I used this for my own personal
		LARGE collection of folders.
 
	- perfectmaildir -
		also for converting mbox to maildir
 
IMAP folder copy
	- imapcp
		- in python
 
	- imapsync - 
		in perl.  Doesn't recopy messages that have already been copied
		before
 
IMAP servers
	- dovecot - I've switched to this;
		it does pretty well with my huge
		collection of folders.  It's designed to be secure, and can handle
		both mbox and Maildir.
 
	- wu imapd - I used to use this, but it was terribly slow on my
		large collection of folders.
 
	- cyrus
 
	- courier - uses a fullblown database, which may actually end up
		being a disadvantage as filesystems gain more database-like
		functionality.  Not Zed, notzed at ximian.com, indicates that
		courier has a lot of bugs (Tue, 08 Jun 2004 09:23:21 +0800).
 
Archiving/removing old mail messages
	- archivemail -
		can both archive and delete (optionally skipping unread messages)
		old mail messages.  Supports mbox, MH, Maildir and IMAP.
 
Go here for the dreaded Microsoft
	information