I WANT to purchase an iMac but my partner is a big fan of Lenovo's think pad. I'm concerned on the compatibility of working excel on a daily basis from OS X to windows and vice versa. In otherwords, taking a spreadsheet, created in OS X, saving it in a flash drive and then opening it up on his windows computer. Can we co-exist on basic office software. I'm not sure how prevelent this is, one person with a Mac and one with a pc viewing and sharing the same data. Somewhat clueless. Thanks for any info.