Outlook 2003 to 2007: lost email sorting rules

I copied the Outlook 2003 pst folder to my new computer.
I opened Outlook 2007 on the new machine, without setting up email rules.
I used File|open|Outlook data file, and browsed to the location of the 2003 pst folder and opened it.
My 2003 data appeared.
I used Tools|Account Settings|Data Files and made the 2003 folder the default folder.
I went to the folder list, right clicked and closed the default 2007 data.
So, I had only the "2003" data folder list showing.
I created the email account, which defaulted to delivering email to the "2003" data file.

And now 100 or so rules for sorting email have disappeared.

What did I do wrong?

 

That ought to do it. Thank you.

Thanks.