IMAP, sent and drafts folder in Mail

So I was using Entourage. Few things, where Entourage did not meet my requirements:
- it shows arrived dates as weekdays for last week, really annoying
- it places my signature always at the end of reply mails body
- there was something odd with IMAP folders. I created a subfolder and moved few folder under that and they dissapeared.

Now I switched to Mac Os X Mail:
- problem with IMAP, once you get your imap folders to mac and try to save a draft or look for sent emails... no way, draft is not saved and sent emails are missing.

SOLUTION: select your drafts folder and go to Mailboxes menu and select "Use This Mailbox for" and select drafts. Do the same for Sent! It works.