Originally Posted by Marc Sabatella 
Yeah, but you might still have to take the time to select the images that need rotation, unless you have a program that has a "rotate according to EXIF orientation" option so you can just run it on everything.
Also, if a program doesn't support the EXIF Orientation tag, it's highly unlikely it supports lossless rotates, so you're probably degrading the quality of your images.
Side tangent - Marc, another post of yours led to me to check out ACDSee's recent versions - I think I'll be buying a license once my trial expires, so thanks for that!