At the moment there is a function allowing me to convert an email to a task.  I would also like the ability to have Evolution convert it to an appointment.  This should work by either right-clicking on the message or right-clicking on a selected region of text in an email.  It should be able to handle messages and extract dates/times from the message, and locations if it can, and put unhandled data in the description field of the appointment.

An example of the kind of message it should deal with is:
"""
Meeting with Bob about Product X
Date: 27th January, 2008
Time: 12:15pm
Location: Board Room B

We should have a meeting about Product X, and discuss the roadmap for the project.  Harry and Jane should also be present.
"""

And also messages like this:
"""
I'll see you for coffee on Tuesday at 6pm, at the Sample Bar, George Street
"""

The second one I understand is a bit more complicated as there'd have to be parsing rules for each language, and be able to handle different sentence structures, whereas the first one would be pretty similar in all languages (apart from the words for Date/Time/Location).

The appointment system should also look for names in the email, and if they're grouped it should associate them with the meeting.  With the first example email, Mary could have sent it.  Mary could be filed in an address book or category of "Work".  Evolution should look through the contacts and see that Bob is a person, and it should associate the Bob that is in that address book or category, rather than Bob in your Friends address book.  It should similarly do that for Harry and Jane - maybe Evolution could suggest adding them to the participants list because it saw their names.

For me, this would be one of those really cool features to have, and help integration with people who don't or can't use calendaring support in their email client, and write appointments out the old fashioned way.