I do. My chat clients are set to automatically log, so that when I talk to someone a week later, I can look at the history. More importantly, a lot of questions get asked and answered over IM, so I can check it for answers to "why is X broken" or "How do I Y, again?", or "what was your mailing address?" without having to actually _ask_ the person again.
I've never looked back at archived IMs from years past, though, but they are still squirreled away on the removed hard drives from past machines.
I've never looked back at archived IMs from years past, though, but they are still squirreled away on the removed hard drives from past machines.