... the last date mail sync worked for me.
What error are you now seeing?
The cure for synchronization errors these days is usually to remove the account and add it back again to refresh the sync relationship with the server. There are a lot of changes going on.
- Right-click on the account name in the folder pane and select Remove account.
- When it's gone, close down Windows Live Mail and wait for five minutes while the program adjusts to the change, then re-launch the program.
- Press Ctrl-Shift-T to start the Add your email accounts wizard, then follow the prompts to set up the account again. You only need to enter your email address, password and display name for outgoing messages - the program will do the rest.
- Wait for the program to re-download your folders and messages. This might take some time (minutes or hours, depending on the number of messages involved), so leave it alone to get on with it.