Oh, yes.. I forgot to update this page - it's fixed in SP1. See http://www.slipstick.com/outlook/ol2010/default_acct.asp#sp1 for the reg key you need to set - it works for Send to and mailto commands without the key but if you deliver pop to the default pst, you need to use the reg key to force it to act completely like previous versions.
Thanks for the reg hack though, that fixed it!
This is a bug, not setting that reg entry! Why won't MS admit it? (Oh, they have a monopoly on Exchange clients.)
2007 and before, we just simply change the default mail account which was used for sending OUTSIDE of Outlook (i.e. mailmerge). Then then changing the default account did nothing, no visible change in any way. We had to change the default PST (like changing the motor in your car to change gears.)
With your once simple reg addition, it works as it always did. I didn't even have a "Mail" section in the Outlook part of the registry.
One year later and MS still can't get it right? I'm angry! Can they tell why no one wants to buy their phones? They are just too big to hear us any more.