One of the many missing features in the Windows 8 Consumer Preview was, in the Mail app, to choose how much Mail to sync and when to sync. You were stuck with the default last 2 weeks and it was unknown when it synced.
But with the Release Preview, that’s all changed, though it’s a little hard to find. You keep the same defaults as in the Consumer Preview (2 weeks), but you can change it by following these steps:
1. Launch Mail from the Start screen (if you don’t have it pinned, search for it):
2. Go into the charms and click settings:
3. Click Accounts:
5. Now you can change when you want mail to check for new messages, as well as how much mail to sync. I’ve changed it to 1 month, as I just need recent email and if I need to see old messages, I just go to the web:
Repeat the steps for all your email accounts you have connected to Mail. I hope this tutorial has helped!