I'd like to switch from Evolution to the light but powerful Claws Mail but did not for only one reason : the lack of integration into GNOME.
GNOME uses evolution-data-server to store everything so that all apps can access data. This allows nautilus-sento to know your contacts, the date applet to know your calendar and tasks, ... Now that we have light interfaces to manage e-d-s data thanks to OpenedHand guys, dropping evolution is even more tempting so I'd like to have Claws Mail to use this data.
Let's consider the 3 parts I see in GNOME integration of Claws Mail:
I see 2 needs:
This part is about adding to you calendar the events you receive by mail. That's more easy, vcalendar support is already a plugin so another one can be written to use e-d-s.
The goal is to have the same functionality as Evolution's "Convert to task". This one is really easy as we only need the dialog to select the category and it already exists in Evolution.