Email access through domain account and standalone account

[zillah]

At work Recently I formatted my laptop , I have got two accounts , domain (AD win2003) account and standalone account.

Domain account is useranem : zillah , password : catcat ,,,,fake one

Standalone account (administrator privildge): username : boss, password : forum,,,,fake one

I tired these within our LAN , I can login into both accounts (zillah and boss).

We are using exchange server 2003 for the email account and outlook 2003 as client .

I can access my work email account when I login as : zillah (domain), but I can not access my email account when I login as : boss (stand alone) ?

Before formatting I was able to access my work email account when I logged in into both accounts,,,OS on my laptop is win2003!!!!