Quick question to you Surface owners (Office 2013)

Is the office 2013 on Surface compatible with Intel laptops which run office 2007?

For example; I write a word doc. on my Surface RT and then transfer it on USB to my laptop to continue working on?

One other question. I am thinking of getting a 64GB micro SD card, will this effectively increase my HDD space? I can save anything onto the micro SD if I choose for it to be saved there?

All your help is appreciated!