I feel you can continue with the advanced stuff provided that the fact is Access 2003 tutorials are applicable to 2007. And then during the tutorial, point out that if still using 2003, this particular item, or event, is not available in 2003.
If in the current ADVANCE levels there are some features that would be associated with a particular lesson, give that lesson an update.
This should help with those of us who are to get the 2007 version for free, the opportunity to still get them for free and you don’t have to spend as much time RE-DOING all the previous tutorials.
I say all this because I purchased ALL the tutorials in the time frame to receive the 2007 upgrades for free; but, I would like to move into the 2007 version without having to wait for a year or so to have the tutorials get past the parts I all ready know.
This way people who come to take your tutorials in the future will be able to get ALL the information from both versions no matter what version there on/using.