Evolution – Generally considered to be Gnome’s answer to Microsoft Outlook, Evolution is a PIM application I’ve had mixed results with over the years. While the basic calendar/email functionality has never been a problem for me, updates have often been known to hose Evolution’s MS Exchange connector.
Sometimes the errors had come about due to a new release of MS Exchange…which is something out of Evolution’s control. Other times, I found bugs within various versions of MS Exchange connector, which is usually within the developer’s scope of control. If you are absolutely in need of connecting to MS Exchange and the connector is working, then Evolution is an option.
For users of the Google Apps-based solution or other groupware solutions, hosted in-house, Evolution also has a lot to offer. Evolution offers its users junk mail controls, smart filtering, web calendar support, and multiple accounts management. The downside is the spotty support for other platforms. While efforts have been made for Windows and OS X support, overall Evolution is best suited for Linux distributions.