Both i386 and amd64/x86_64 are supported, except RHEL/CentOS 7 (x86_64 only).
 SOGo groupware provides webmail, calendar (CalDAV), contacts (CardDAV), tasks and memo/notes services. Full/native Exchange protocol support requires OpenChange and Samba4, but they're not integrated in iRedMail, so iRedMail doesn't provide full/native support for Microsoft Outlook clients, Apple Mail.app. Mobile devices (iOS, Android, BlackBerry 10) work fine with ActiveSync. Check our documents to setup these supported clients.