Can you set up 2 separate outlook calendars in outlook 2003?

I know how to set up two separate email accounts using outlook 2003 where you can toggle between the two accounts for sending and reading emails. However, when you send calendar invites on outlook, it says “sent on behalf of xxx from xxx@companya.com for xxx@comapnyxxxx.com” or something similar. It references both emails on the send invitation. Does outlook 2003 calendar have the capability to totally separate the two calendars? I feel that outlook calendar is assuming that one email account is a “designate” of the other thus this mixed up situation.

Any solutions to keep calendars separate between the two outlook email accounts?