When comparing SOGo vs Squirrelmail, the Slant community recommends SOGo for most people. In the question“What are the best self-hosted webmail clients?” SOGo is ranked 5th while Squirrelmail is ranked 7th.
Ranked in these QuestionsQuestion Ranking
Pro Calendaring and messaging data can be accessed via web and multiple desktop and mobile clients
Available in 30 languages.
Pro Microsoft ActiveSync support
Pro Fully responsive
The UI is fully responsive, and works fine on desktop, tablets and phones.
Pro Drag and drop interface
Folders, contacts and events can be moved around with intuitive drag and drop functionality.
Pro Very mature
Squirrelmail has been around for a long time.
Pro Has many available plugins
Can do things like change Linux user passwords, configure vacation "out of office" messages, configure procmail .forward files, etc.
Con Very old
Squirrelmail has been around for a loooooong time!