Wrong answer. As far as I know, you can freely develop in any release of Microsoft Express Edition, if you do not redistribute it commercially.
EDIT: I swear, I read a license for a while that said you can't. They must have changed it on me, or it, or I'm thinking of a license for my student publication. Sorry.
Other Editing: just clarification, my initial answer was completely wrong, I lost my MS licenses. As far as I know, after reading the licenses last night, you can develop content with Microsoft Express Edition software in your heart.
mnuzzo
source share