Kolab is a secure, scalable and reliable groupware server. It is formed by a number of well-known and proven components and adds intelligent interaction between them.

The Kolab ActiveSync Server allows users of ActiveSync-capable clients to access their server mailboxes and have Kolab-provided PIM-functions available. It uses Syncroton, a PHP library for the ActiveSync protocol which is used by Tine 2.0 and Kolab to provide synchronization of contacts, events, tasks and emails to their users.