This statement got me thinking - why do we always think of PIM as a mix of
1) Calendar component
2) AddressBook component
3) Todo Component

Why cant there be 1 app - which has all these functions built in and integrated as a single interface (with sections maybe to differentiate some aspects - particularly the GUI part).

I am just thinking about the functions (not GUI aspects) here.
A single app which shows events, contact, notes, reminders, and todo's and which all speak in the same language (data format) so that function one can inter-operate with the other seamlessly without those pesky import/export formats ...

Of course one major impediment to this thought of course is that the rest of the world already thinks (and designs) PIM as those separate components with their own data formats and protocols, so we have to support all those protocols for each of the functions I guess to interact with the rest of the world's PIM apps.

Just trying to jiggle my mind ... sorry if I am not getting anywhere with this.