Gmail is really starting to stand the test of time as the best email client. Unlimited storage, clean UI, easy sorting and preference tools are just a few of its perks. The most recent redesign has been a huge productivity boost for me as I can now have several new emails started as pop-up windows and still be referring to information or email addresses from an open message in the main window. Really love the integration with Gdrive which I have used to almost completely replace my use of the Microsoft Office Suite due to its cloud-capabilities, sharing permissions, and the ability for teams to real-time collaborate on the same document at the same time (though you could argue SkyDrive is offering similar features). Don't mind the social integration - it's nice to make those connections even if you're not particularly into G+ which I am not.