When comparing Atmail vs SOGo, the Slant community recommends Atmail for most people. In the question“What are the best self-hosted webmail clients?” Atmail is ranked 4th while SOGo is ranked 7th.
Ranked in these QuestionsQuestion Ranking
Pro Intuitive interface
Pro Powerful yet easy to use admin tools
Pro Browser, desktop and mobile versions
Pro Plugin support
Pro Drag and drop interface
Folders, contacts and events can be moved around with intuitive drag and drop functionality.
Available in 30 languages.
Pro Calendaring and messaging data can be accessed via web and multiple desktop and mobile clients
Pro Fully responsive
The UI is fully responsive, and works fine on desktop, tablets and phones.
Pro Microsoft ActiveSync support
Con Closed Source
Appears to be a proprietary product.
Con Bad UX
It's slow and unintuitive.
Con Not Free
As in Beer or Software.