if you use microsoft office in both Windows PC and Mac, no issue with formatting.
if you use microsoft office in Windows PC while some open source word processor (like OpenOffice) in Mac... generally no issue with formatting as well.
if you use microsoft office in Windows PC while Pages on Mac... i know that the file will still be compatible, but I'm not sure whether the formatting will run a bit in this case.

2011 n 2013 should be compatible to each other

From my experience, that is deleting both from your yahoo and macbook.

just testing out osx mavericks for a week already. Still not used to it yet cause a lot of applications in windows cannot find in mac or must pay.

1) winrar alternatives not good enough. Most like unarchiver will extract th file directly without asking. Sometimes I just want to view the files only.

2) If you think windows file explorer sucks. Wait till you try finder in mac. This is very unituitive for powerusers like me. Navigating folders is a total pain. Cut function is not even available by default. Need to install third party tools. Path address also missing. So those who want to type in path directly need to find third party tool again. Unhiding hidden files? Prepare to learn terminals.

3) irfanview32 or something like this is not found in mac. OSX's own preview is not that powerful especially in navigating pictures. Need to click on them one by one. Worst thing is, something similar to irfanview32, you need to pay for third party apps.

4) mounting of network drives sucks. Have to manually mount every time after boot. Putting a script during login doesn't work cause network drivers load too slow.

5) no NTFS write support. Have to get third party PAID tools. A method to hacking to get NTFS write work is buggy at best. Always corrupt the NTFS partition.

Of course there are also some good things about using OSX. However, I would say OSX is a bit overrated. Even some linux based GUI is more intuitiv than OSX's few basic features. In the end, I would agree that osx are catered for zero entry PC users that does not know much about PC. If you want to grow into power user then OSX will fail to cater for that...at least not as well as windows or linux.

oh..one more to add.

6) osx's default mouse control totally suck. Adjustment is also limited like for wheelscroll and acceleration. Have to install something like smoothmouse to make it slightly better.