Ask HN: Is it dangerous to connect a PC that's been off for 10yrs to Internet?

Suppose I find an old laptop of mine, from early 2010s, that has not been used since then. I turn it on and it boots Windows XP or 7. Is it dangerous at this point to connect right sway to the Internet? What precautions/steps do I have to do? What if it is from 2000s instead?

Thanks and sorry I had to compress the title