Whenever I suggest to my friends switch to Linux, there are two questions I get. The first is always "Can I work with MS Office documents?", and I am happy that I can say firmly yes, thanks to OpenOffice.org. However, then the second question follows "Can I sync my calendar/todolist/addressbook in cell phone with it?", and unfortunately then I begin to think about the state of opensync, and I am getting really defensive.
If the Thunderbird-opensync-any-widely-used-cellphone connection was made really (I mean, really) functional, it would help a lot.