Don't auto load first message
Provide an option to not select an email by default during the initial load. Wait until a message is clicked on. I don't like to load spam etc... if it did not end up in the correct folder.
Thanks for trying the Outlook.com beta! We are happy to inform that you can already change whether the first message is automatically loaded.
1. Find the Settings panel > Mail > Layout, or visit https://outlook.live.com/mail/#/options/mail/layout
2. Choose to “Let me select which message to read first”