What is the best webmail viewer?

Webmail means a web application where user can login into his mail box read mail and send to others. Its a convenient way to access mail box when your personal computer is not with you because you can access from anywhere.

In shared hosting webmails most of the provoders are giving three options like Horde , RoundCube and SquirrelMail.

In squirrel mail has all the basic email client features like adress book, spell check etc.,

Roundcube has more better User interface and more added features like editing in html format etc.,

Horde comes with all the features mentioned in above two and this email management system have advanced filters, email attachment, last login location or internet provider name for security purpose.

So what email viewer you mostly prefer to use?

On the desktop I use Thunderbird as it is easy to manage multiple accounts easily. I seldom have occasion to access those accounts when I am on the road but when I do I usually use SquirrelMail out of habit.

I use outlook application to access my emails which is a desktop friendly and emails will be stored in local computer.
I use it in IMAP mode, so that emails will be stored on server and dynamically accessible. If we use POP3 then there might be some data loss in web mail, because we can't get read messages in webmail which will be stored into desktop application.

I use Thunderbird, too.

I'm using Thunderbird (on PC) as well with ~ 20 mail accounts in it.
And for Android Phones I'm using MailDroid.
Both apps are awesome.

Yup I'm too On desktop uses Thunderbird.

I'm using SmarterMail for my clients.