Simpler Outlook layout
I've migrated from Outlook, and while I appreciate all of the layout options you provide, no options are as simple as what I had in Outlook. Outlook allowed me to have three columns: Sender, Subject, Date Received. (Actually they allow for a lot of customization, but this is how I liked it.) I like being able to search each column for what I wanted instead of having all of the information within one column like you do. When I am working on a project, and I have dozen of emails coming in every minute or so, having all of that information within a column format helps me find my email thread faster.