List of browsers supported by the full version of the Kerio WebMail interface can be found at Kerio Technologies.

For technical reasons, the full version of Kerio WebMail cannot be run in older versions of the listed browsers or in non-listed browsers, but it is possible to run the simplified version Kerio WebMail Mini (for more information, see chapter 2  Kerio WebMail Mini). Kerio WebMail Mini is run automatically in older versions of browsers, in text-based browsers such as Lynx or Links, in web browsers designed for mobile devices (this view type is described in chapter 3  Kerio WebMail on mobile devices). Kerio WebMail Mini does not require CSS and JavaScript.

To use the secured access to the Kerio WebMail interface (by HTTPS protocol), the browser must support SSL encryption. If it can be configured (e.g. in Internet Explorer), it is recommend to enable support for SSL 3.0 and TLS 1.0 versions.