Comparison Summary

Both Windows Server 2003 and Exchange Server 2003 provide the same POP3 experience to users. However, Windows Server 2003 only offers POP3 messaging experience to the user and limited administrative features to the administrator. It is best used in situations where basic messaging or administration is required.

Exchange Server provides not just the POP3 experience but rich messaging and collaboration options to the user. It also offers better administrative advantages in terms of managing a complex messaging and collaboration environment in efficient ways.