A graphics-heavy PowerPoint file could actually use less disk space on a Mac!I was working on a presentation at home on my iMac and the file came to a hefty 4MB. But when I re-saved the file in Windows -- even after compressing all of the images to be optimised for the screen, the file size weighed in at a whopping 8MB!
I saved half the disk space on a Mac!
This was admittedly a non-scientific observation. But still, saving 50% of disk space is quite a significant difference. Truly, the Mac business unit at Microsoft has churned out the best version of Microsoft Office.