VMWare Zimbra - Unified Communications

Click-to-Call: One-click dial for numbers in Zimbra Web Client; bridges the call to customizable numbers (home, desk or mobile)
Visual Voicemail: Integrated access to voicemails in the Zimbra Web Client, inline playback, pause, delete, forward, download, restore and call back numbers; delete, read, and unread are synchronized across phone devices
Instant Messaging (IM) and Presence: Click-to-chat from hover over contact card of any address; rich presence displayed from anywhere in the inbox; launch IM using desktop chat clients with Click-to-IM
Call Record History*: View missed, placed and received calls in the Zimbra Web Client; initiate call backs from the numbers in the record history
Web Conferencing*: Complete integration available with Cisco WebEx; users can manage, launch, and join meetings. Add WebEx details to calendar

Easily configure and manage user access and policies through the Zimbra Web-based administration console accessible anywhere, anytime
Set up user preferences in three easy steps with integrated authentication and provisioning
Standards based framework enables Zimbra to easily integrate with existing UC deployments
Out-of-the-box integrations with Cisco and Mitel
Extensive support for custom UC integrations through the Zimbra SDK
Broad UC Partner Network that offers freedom of choice for UC solutions

UC features can be delivered by either client side integrations or server side integrations
The client side enables faster IT implementation and extensibility using the Zimlet framework (Javascript & web services) that proxies directly to the UC server for features
The server side is Java-based and enables tighter integration and enhanced user experience with the features delivered to web client by the ZCS Server
Open source code and documentation available for custom UC integrations
Flexible implementation options enable IT to balance TCO and UC needs and extend as business needs evolve

VMWare Zimbra -Unified Communications