Thunderbird

 Eudora

 Pros:

• Accessible from multiple locations
• Free, no ads
• Open source, so constantly developed by a team of volunteers
• Interactive Idap directory support
• Trainable junk mail filters
• No error messages about table of contents being out-of-date
• No remote instance errors
• Better security features

 Pros:

• Polished user interface developed over several years
• Built-in features that get updated with the program updates
• Tabbed viewing
• Timed message feature
• Good group email feature

 Cons:

• Basic program, must add extensions for extra features
• No tabbed viewing
• Attachments are kept on the server unless you save them to M: drive
• No queued (timed) messages
• No built-in signature editor

 Cons:

• Stored messages accessible only on-campus
• Ad-supported
• Junk email controls only with paid version
• No future development