This will be brief.
Inbox zero is a valuable thing to maintain. Roughly promoted around the web as having an empty inbox.
An email inbox collects a few things:
- junk
- automatic mail sent to you
- personal mail sent to you
- work sent to you
- (maybe - work you send to yourself because that's the best way to store information for now)
- Old as all hell (or other friendly name)
- 2014
- 2015
- 2016
Don't know, not the original author. What do you think the chances are than an email on the third page of your inbox will ever get a reply? Inbox purgatory seems to me like a way to give up on something without having to admit it yourself.
If my inbox has more than 40 or 50 items in it I feel demoralized and find it harder to work through newer items, so the easiest way for me to stay at steady-state is to keep my inbox at zero or close to it.
Counterpoint: I've kept to an empty inbox for many years, but know people with ever-growing inboxes whom I consider more organized and responsive. I've never declared email bankruptcy during my professional life and don't know the consequences.