Gmail

Pros

• Excellent uptime.
• Good value when you use the free version

Cons

• There is no support, even if you pay the $50 per year, per user it is not worth it. There really is no support with gmail.
• Slow, over-used servers
• Annoying ads
• Poor privacy

Thexyz

Pros

• Nice, easy to use webmail interface that is 100% ad-free
• Supports ActiveSync
• Great support and very reliable
• Webmail interface includes built-in calendar and notes

Cons

• Servers are currently based in North America

Fastmail

Pros

• Even with recent trouble, they have good uptime
• Dedicated to providing good email service

Cons

• Brought out by Opera
• Support is nothing special

Hotmail/Outlook

Pros

• Pretty good webmail interface

Cons

• Does not support SMTP
• No support whatsoever

Rollernet

Pros

• Own data center
• Under active development, and their blog is updated frequently

Cons

• Basic Roundcube and Squirrel mail webmail interface
• Is a bit on the slow side

Tuffmail

Pros

• Reliable uptime record

Cons

• No active development for a long time.

LuxSci

Pros

• Good uptime record
• Good support team

Cons

• Not a very good looking webmail interface

Redpin

Pros

• Been in business since 2002
• Good support

Cons

• Disk space is too expensive

PolarisMail

Pros

• Pretty good support
• Enhanced accounts support ActiveSync

Cons

• Webmail is a bit confusing at first
• Lacks solid documentation

EUMX

Pros

• Friendly and fast support
• SSH/SFTP access to one’s account, making for easily scripted backups

Cons

• No updates
• Ugly webmail interface