Hiri for Windows

Basics:- Fully integrated calendar- Tasks- Contacts- Built for Exchange, Office 365 and Outlook.com- Uses Microsoft's own protocol - EWS. So if you need to go back to Outlook, everything will be synced.

Nice features:- Great task list built in. You can just drag an email to the right-hand side to make a to-do item out of it.- Super fast search- Triage emails using the Action/FYI filters. - Deal with emails using the 4 D's - Defer, Delete, Delegate and Do.- Send emails with actions- Dashboard and timer to remind you not to check email too often (this is a really bad habit!)- Nice touch - the subject line is at the bottom of the compose window. You'll write a better subject line AFTER you've written your email. Get your emails noticed.