With so many mail server choices, and most offering web mail, how do you choose the best solution?
 
Mail servers tend to have weaker interfaces that what clients have come to expect from mature commercial free mail and web mail.  This include services such as hotmail.com or email.com.  For this reason web mail is typically used only in certain circumstances (in airports, when away from the computer, hotels etc) and not used as a replacement for a regular mail client.
 
If web mail is to be the primary interface for your companies users then you should look for a template based solution.  This will offer you a way to modify the look and feel of the interface and in some cases the functionality.
 
For most mail systems performance is not an issue given the state of today's fast and economically priced hardware.  See our article on hardware for more details.

The main advantage of web mail is in the administrative options.  This allows users to manage their own passwords, forwarding and setting simply and easily.

On the domain admin side if you manage multiple domains then domain administrators can control settings and even create and remove users and alias.