The built in search engine can go back by quantity (150 items) and that's it. Years ago we had a total user post listing which was kind of interesting because the whole list was there for any one user but it went away at some point. I think the total number of posts was taking up a fair amount of space and making life hard at the administrative level. Just a guess.

However, there are a couple other way to find things. The best is the Google search window at the upper right, but a quick test shows it only finds a thousand of my own 5,000+ posts. I do not know what the reason for exclusion of the other ones is unless Google also employs a return count maximum. Oddly enough though, it went back a long time and I have heard companies like Google do an immense amount of archiving. Scary what they know...

Another technique which is really cool but kind of hit-and- miss, is this Wayback Machine. The WBM has been sending out spiderbots for years to hunt around on the internet with no particular goal, archiving what it sees ona given day in a free database. The problem is it only goes a few levels deep on any one website- broad and shallow, never very deep, and it is pretty random selecting dates to archive. You might get a few pages here and there from old APC forums one day with most of it remaining unseen, with searching queries limited to specific URLs. I have however found some really old posts from APC there.