Sometimes I will use something and realize I’ve owned it forever. It’s a nice change in our throwaway reality. I think my personal record is a bicycle multi-tool I got for one of my first bikes, ~25 years ago. Still have it, still use it. When it comes to electronic devices I have a Panasonic mini Hi-Fi from ~2005. Never felt like changing it.
What’s your record?
An email of all html is an unwanted email 99% of the time. Occasionally, I save it, and open in lynx. (When a web site emails a security code.)
Attachments are more of a hassle, because I frequently need those. Save to a temp file, "munpack file", examine extracted files.