[Mojary]

Maybe a stupid question...but have you tried doing "send/receive" on the menu to manually sync messages on your phone?

Check your sync status to see what it is set to. Check your settings by going to your Windows Live/Hotmail account on your phone>Menu>Tools>Options>Tap Screen on Hotmail (should already be marked by *)>Sync Schedule.

or check to see how many days your folders are set to get messages (this one works for all email accounts you have set up on your phone):
and to set how many days of email your account should sync/download on your phone, go to Menu>Tools>Manage Folders>Tap & Hold on Inbox (or any of the folder you want to set) 'til pop-up menu appear>Folder options. This will enable you to set how much of the messages will be downloaded to you phone and specify how many days back of messages to get on your phone.

hope this helps...oh yeah...i noticed just now that my hotmail account on my phone is somehow unable to sign-in.