Each email accounts with servermx.com has SOGo(+) 2.3 Groupware available (*) (**)
What is SOGo
SOGo is a free and modern scalable groupware server. It offers shared calendars, address books and emails through your favorite Web browser or by using a native client such as Mozilla Thunderbird and Lightning, Apple Calendar and Address Book (Mac OS X and iOS) and Microsoft Outlook. S SOGo is standard-compliant and supports CalDAV, CardDAV and reuses existing IMAP, SMTP and database servers - making the solution easy to deploy and interoperable with many applications.
Scalable architecture suitable for deployments from dozen to many thousand users
Rich Web-based interface that shares the look and feel, the features and the data of Mozilla Thunderbird and Lightning
Improved integration with Mozilla Thunderbird and Lightning by using the SOGo Connector and the SOGo Integrator
Two-way synchronization support with any Microsoft ActiveSync-capable device (Apple iOS, Android, Windows Phone, BlackBerry 10) or Outlook 2013
Excellent native integration with Apple software (Mac OS X and iOS) and Android-based devices
(+) SOGo web client is not able to work with your own domain name. It works with the domain servermx.com
(*) Funanbol protocol is not available
(**) SOGo vacation message is not available. In the Control Panel there is "Reply text" for the same purpose.