I've got both, I use the PC mostly - the mac is a backup for internet. The mac is different, after years of pc, the mac is a whole different thing. Another thing that really helped me was going to OpenOffice - Microsoft Office is a pig, and its ridculously expensive if you don't get a student discount. Sun/Oracle Open Office is free.
Did you try to change the point size? perhaps you can reduce 12 pt to 10 pt to get back to 25 pages?