All Things D writes, Q: I’m interested in the new Microsoft Surface, but am confused about Windows 8. Some things I read say it can run my current Windows apps, like Outlook and Quicken and iTunes. Others say no. Which is it A: Both. There are two fundamental branches of Windows 8: the full version and a more limited version called Windows RT, which is what the Surface and some other new computers use. On the full version, you can run all the apps you mentioned, plus new-style, tablet type apps. But, on RT—and therefore on the Surface—you can only run the new-style apps, plus a handful of...