[kevkav]

I do agree that the Outlook web app is good and is getting better all the time. Personally though (and I think a lot of people would agree), I like to have a standalone email client that doesn't constantly get lost in tab clutter.

[jrockway]

Having used webmail for about 7 years (I used Gnus before), the tab clutter problem is easy to avoid. Right click the tab, select "Pin tab", and you're done.