Hello - First post in this forum, casual lurker. I currently have a 2011 Mac Mini i5, with 500GB HDD and 8GB RAM. I have Office 2011 installed, among other stuff. Aside from the 8GB, self-installed, the specs are not so different from the Macbook Pro (processor speed and disk capacity). I recently brought home an Excel file of 18MB in size done in Office 2007 (PC), plugged in the USB thumb drive, and tried to open the file on my Mac Mini. After several seconds, I got an "Out of Memory" message. I found it rather odd, so I copied the file from the drive to the desktop. After clicking to open the desktop file, the same message popped up. I was able to open the file in my ole Lenovo g530 laptop. I am wondering if it has anything to do with the fact that the file was done on Excel PC (2007) and tried to open in Excel Mac (2011). Has anybody had a similar situation on a Macbook Pro? If so, has it been mitigated by running Boot Camp / Windows / PC Office on the Pro? Rumors say the next Pro refresh is in October, so a deal could be had on the existing model, but I'd fear stumbling onto a problemm just like the one above. If you read this far, thanks!