Tons of spam all of a sudden

Kidsandliz thought this was worth mentioning said

One of my emails is outlook. I haven’t been on the internet much the last week or so, certainly haven’t clicked on anything suspicious (even missed a day with the click face here) and suddenly I am getting 100+ spam emails a day, mostly landing in my inbox rather than my spam folder.

Anyone have any idea why? This email I have had for years and seldom got spam until this recent flood. Any ideas how to make it stop?