This one is from GMail blog. Top 9 reasons why one should use the archive facility in gmail(I use it): 9. Phone numbers and addresses You never know when you'll need a phone number someone emailed you or an address that was in a signature. 8. Procrastination Sometimes you want to get a message out of your inbox, but you don't want to deal with organization, and you don't want to trash it. 7. Posterity Just because you’re not famous now doesn’t mean that in forty years (or fifteen minutes) you won’t want to write your memoir. 6. Winning arguments “But on May 5, 2005 at 8:43pm EDT you said….” 5. Mailing lists Do you really need to know what Clintobamccain is doing every day? Auto-archive* their messages until you want to donate again. 4. Birthdays Search for “grandma birthday” and voila, find the message you sent her last April. Aren't you glad you archived instead of deleted? 3. That guy Remember that guy you thought you’d never need to get in touch with ever again? 2...