Re: unsolicited
"What is a reasonable time? Every circumstance may vary, but I'd have thought 99.9% of people check and clear their messages at least once per week. Most people are several times per day."
I delete my "Junk E-mail" and "Deleted Items" folders about once a year. I have rules that filter lots of incoming mail directly into "Deleted Items". I can easily receive something unsolicited and have it stick around for ages.
How often does a normal person purge their temp folders? And you and I both know that I can do all of the above and still get the data back a year later if I wanted. The law is an anti-intellectual law designed to root out dissidents and make them hangable.