I clear out my inbox once or twice a year.

As for what there is right now, here's the unread stats...

Inbox: 1,893
Spam: 125
Facebook: 964
Google News: 3,390
LJ Comments: 16
Reported Posts: 7,881
Twitter: 348
vBulletin: 39

I think it's time I finally sorted out Outlook on my home PC. I still like Y!Mail in general but I'm way more organised when using Outlook.