Every company that uses such software has their own libraries and their own footprints. First of all because you don´t trust your products to something that you didn´t make.
Second thing is that footprints and SMD especially need to be tailored to the solder paste youre using, the reflow process and lots of other stuff.
Also, if a part has just been produced last month, do you expect it to be in the library as well?
You can try searching for libraries, or simply open the mircocontroller.olb and copy some other pic that is similar, then edit it.