Got pleasantly surprised...
I've been using Outlook for most of the past year (both business / consumer usage) and I have to say that my opinion on the many features which I used to deem "useless for what I do" has changed dramatically over the past months. Needless to say that the business aspect is a big part of this; saving time is a good thing for me.
I've become somewhat of an in-between type of guy. I collect a fair amount of e-mails but Outlook makes sure that the e-mail piles don't get too big.
But I've become pleased with the option to tag messages. Basically all incoming messages get tagged (categorized) except mails from sources from which I receive less interesting stuff. Newsletters, updates, some mailinglists, etc. Those are kept for approx. 3 - 4 months then get automatically removed. The nice thing is that this happens while those messages basically sit in my main inbox; I don't have to specifically separate them or so nor do I have to worry about other stuff getting removed too (which happens if you remove based on date).
But what I consider to be nice is that you can mix your archiving or cleaning strategies. Other folders (think logwatch or software update messages) simply get purged after a few months. While others get automatically archived, sometimes also based on a category but usually based on their timestamp (meaning: their messages get copied to a somewhat static PST file).
So while I have to wade through quite a large amount of e-mails it doesn't grow over my head.
Needless to say; setting the whole scheme up took its time of course, but now that things are working as they should the whole thing actually manages to save me time & disk- / mailbox space.