Sync Windows Live Mail Between Computers Possible Solution
All I know on how to do this is when you have read a message on 1 PC it automatically turns it to read status. In order for it to stop doing this you have to stop it from doing so.
To do this go to:
Options ==> Read
Untick the 'Mark message read after displaying for 1 secod.'
Then what you have to do to mark it as 'read' is right click the email & click 'Mark as read.'
I think to keep them synced you also have to the following:
Options ==> General
Ensure that 'Check for new messages every 30 seconds' is ticked but change the 30 seconds to 1 second.
I hope this helps.