Hotmail used to do this (they might still). It was horrible. About once a year or so, I'd log in to my creaky old hotmail account from the 90s to find that th

Hotmail used to do this (they might still). It was horrible. About once a year or so, I'd log in to my creaky old hotmail account from the 90s to find that they'd deactivated my username for inactivity. It's still the 2nd contact for some old accounts, and the only way into MSDN, so that's not cool. The only way to turn it back on is to upgrade to whatever their current flavor of "pro" is, pay $10 for the month, then immediately cancel it. They take the further step of completely wiping all your old email while they're at it, so you come back to an empty inbox with no hope of finding that old email you were hoping to fish out. Rows in your database are free. Don't do this.