Although I changed job roles earlier this year, I still get internal emails which get routed via inbox rules to folders rarely touched these days except for select all/delete. However, as I'm looking at migrating to Exchange 2007 when I find the time, these set of 24 webcasts on Exchange Server 2007 could be useful.
I haven't got the links to Parts 4 and on yet, but keep an eye on Eileens blog for an update
There's also a few webcasts running before the 24 hour series:
Of course, if you want to try out Exchange 2007 easily, you can download a fully pre-configured VHD to run under Virtual Server 2005, which will expire after 30 days.