Changing default send mail account for meeting invitations

[cityboy]

I am using Outlook 2003 SP2. I have 2 email accounts set up: 1)Default
is a POP3 box for an Internet email account 2) An Exchange 2003
account that does not have internet mail enabled -- it is only used
for internal company communications.

I find that when I send meeting requests to internal company users
(who also have Exchange mailboxes), the meeting requests are
automatically sent using my pop3 account and not through Exchange.
This normally poses no problem, except when I send a request to
someone using Outlook 2000. Then the request comes through as plain
text.

I've researched the iCal issues related to meeting requests between
Outlook 2000 and newer versions. I've tried both checking and
unchecking the option "When sending meeting requests over the
Internet, use iCalendar format" Neither way solves the problem.

Any ideas?

I'm wondering if there's a way to force the meeting request to be sent
via my Exchange account, even though it's not the default. Can this be
done?

thanks