Is there anyone who has the n900 that has lots of emails (100+) that are being synced via IMAP? How is the performance on that, and once its synced, and you go offline does it store a local copy of the recent emails?

I don't get to do deletion on my accounts that often (busy busy). Part of the reason why I'm buying the n900 is so I can keep up to date with emails. But I was wondering if I should go with a POP solution or a IMAP solution, my current gmail and hotmail accounts are a mix of both but I was thinking of switching them all to IMAP that way everything is synchronized. (though when Thunderbird downloads them they're still not marked as read already...)