Hello All! This is my first post on and very first MAC to have ever owned. As a long time PC user, I never considered ever buying an Apple product. But never say never, right? However, I recently purchase an iBook G4from my best friend, for my son who needed a laptop for his high school homework. I was so intrigued with his laptop, I went online and bought two more iBooks for my daughter and myself. My first question is memory. http://support.apple.com/kb/ht2206 Can I used any type of laptop memory, including ram from older PC laptops, if they meet these specs? If the bus speed is higher than PC2100 or PC2700, but is SO-DIMM and 200 pin, can I still use them? Last question, once I upgrade the memory on each iBook to 1.5gb, should Office 356 run decently on these laptops? Each laptop has OS X 10.5.8. Office 365 minimum specs states I could, but I wanted to see what your past experiences have been with this product. If your experiences have been poor, what other office suite product would you recommend? iWorks? OpenOffice? Thanks for your help!