Originally posted by deejjjaaaa K10D now can use 4.4 too...
You can use it, but I don't think the configuration changes at all.
With Lightroom 1.4, my K20D photos use ACR 4.4 calibration, my K100D photos use ACR 3.6, and my DL photos use ACR 3.3. In other words, that's when the camera was last calibrated by Adobe. So whether you have ACR 4.4, 4.3, or 3.6 (or anything in-between), you'll have exactly the same camera calibration. (Which I've ended up tweaking slightly to get the reds I want from it, which so far, hasn't been an issue with the K20D shots - I'm blaming ACR, not the K100D, for this, as I consistently got great colors with the K100D from the bundled software.)
Someone's who's more of an Adobe expert than I can correct me, but I'm
fairly sure that I'm right.