Outlook uses wrong account to send messages   

Hello,

I've had two Hotmail accounts (Professional and Personal) for years, and 
have used them in Outlook Express, and now, with Windows Vista and Office 
2007, I use Outlook.  They behaved properly for months in this new 
environment.  
Then suddenly, in the last week or so, messages that I sent from my Personal 
account appear as though they were sent from my Professional (default) 
account.  The "From" field in the recipient's e-mail is the Professional 
address and the messages appear in the Sent folder of the Professional 
account, yet I've sent them from my Personal account.
I've made no changes to my envioronment. 

Upon further examination, it seems that whichever account is listed first in 
the Tools / Account Settings screen "wins" and becomes the default From 
account no matter what is specified in account settings.
Any idea what's going on?
-- 
Programmer on Budget

date: Sun, 11 Nov 2007 08:38:00 -0800   author:   Budget Programmer