@online: amazing things happen when you set your mind to it

Yes, I didn't know I actually had a box with over 28,000 mails!

And here's the springcleaning report from the other mailboxes:

Personal Gmail (Was: 283, Now: 109) (Change: -174)
Work Gmail (Was: 407, Now: 146) (Change: -260)
Work Intramail (Was: 1393, Now: 1130) (Change: -263)
Work Sales Intramail: Was: 383, Now: 383 ) (Change: 0)
Work Marketing Intramail: (Was: 263, Now: 254) (Change: -7)
Work YahooMail (Was: 205, Now: 143) (Change: -62)
SPCG Mail (Was: 51, Now: 0) (Change: -51)

Target Change: - 1500
Current Net Change: - 817

Keep in mind that all these mailboxes are active (that means that they had daily additional mails coming in that weren't accounted for), plus I didn't include checking through spam folders, clearing out trash bins, as well as other archiving, I'm pretty certain that I have technically already achieved my target for the week. But being the generally anal person about targets, I'm still going to try to hit a solid figure of deleting/clearing/archiving 1500 emails by tomorrow evening. :)