Use mutt with several accounts on same server

	I use mutt with sevreal accounts on different servers through folder-hook, account-hook, etc.
But now I need to use it with two different accounts on same server.
I do not succeed in differentiating them since folders are names imap://server, and I cannot use 
imap://user1@server and imap://user2@server.

How would you do this ?

-- 
Erwan David