HTC Desire :: Cannot Get Any Hotmail Emails Into The Inbox

He's set up his gmail and work mail on the phone just fine, but his hotmail is playing silly buggers. The gmail is through that app, the work and hotmail through the desire mail app.

Anyway - he cannot get any hotmail emails into the inbox. When you first set up the account, he gets two 'welcome' mails - the kind you get when you set up the mail account online, welcoming you to your inbox. No other emails ever come through.
However - he can send from it. And it appears in his outbox online.

I looked in the syncing sections and under the exchange active sync - which works for his work - there is no hotmail. Except somehow it must sync somehow as it's sending his hotmail fine...