Notes tab might be useful, as well as the task tab.
price, the functionality I used in MB ver1 is no longer there (or at least isn't obvious).
The best feature of MB to me was the toolbar icon that allowed you to quickly compose an email. NowI see three tabs in this icon: Activity which doesn't seem to do anything, Notes which allows you to put a note on an email (but this icon only displays the ones you have created), and Tasks (similar to notes). So, it appears the feature I used MB for is now not there at all. :(