Why four thirds?

[Ross the fiddler]

Getting back to, "Why Four Thirds". It allows me to crop 3:2 when & where (vertically) I want. Since I save both JPEG & raw I can set the camera to the 3:2 ratio if I want, but there is still the whole 4:3 image in raw to play with. Actually, I've noticed when cropping a wide (12mm) image in Capture One there is an extra amount of image available that was cropped with the lens distortion compensation & I can use that extra amount, particular when cropping for 3:2 & 16:9 output, so I end up with a wider image than was designed & intended with that lens (12-40).

BTW, in response to a comment above, Olympus DSLR's were fine except for the limits with those Panasonic sensors (particularly the small range of ISO) that was being used then. The E-3 was a favoured camera for many users (including some pros).
The other thing that sometimes gets misunderstood with the less aware is that the Four Thirds sensor is used in Micro Four Thirds camera, not the sensor being 'Micro'. I think they should have named the later system as "Mirrorless Four Thirds".