In my macbook (OS X Lion) I use Mail app with a work email account (non gmail or apple, or yahoo, etc). I would like to use iCloud for syncing email incoming and sent between iPad and macbook, but it seems you can only use it with mobile me accounts. Is there any way to circumvent this?
Forward the incoming mail from the other accounts to your @me account.
If one is for work you could also create another @me account and set up that account to receive the forwarded emails from the other accounts.