Its main components include integrated mobile email for all popular smartphones, anti-spam and anti-virus protection, Outlook and Entourage groupware support, Kerio WebMail, archiving and backup. Groupware features include shared and public email, calendars, contacts, notes and tasks. Kerio MailServer supports multiple domains and fully supports Active Directory and Apple Open Directory for user management. Kerio MailServer runs on Windows, Red Hat Linux, SUSE Linux, and Mac OS X.