Thanks Shawn.

I had set all those settings correctly already, as I had in the past with Outlook 2003. However, your suggestion prompted me to delve a bit deeper. I thought I had tried this before, but we all know where assumptions get us.

Anyway, I fixed the problem by going to:

• Tools > Options > Mail Setup > Send/Receive
• I selected my "All Accounts" and hit "Edit"
• Ticked "Include the selected account in this group"

That did the trick. Don't know why it wasn't selected to begin with - perhaps an artifact of the migration from Outlook 2003 to 2007...

Thanks