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The basic features of Skype for Business include:

Instant messaging (IM)

1. audio call

2. Video call

 The advanced features relate to the integration with other Microsoft software:

• Availability of contacts based on Microsoft Outlook contacts stored in a Microsoft Exchange Server

• Users can retrieve contact lists from a local directory service such as Microsoft Exchange Server

• Microsoft Office can show if other people are working on the same document

• All communication between clients is done through a Skype for Business server. This makes communications more secure, since messages do not need to leave the corporate intranet, unlike Internet-based Windows Live Messenger. The server can be configured to relay messages to other instant messaging networks, avoiding the installation of additional software on the client side.

• There are several types of clients available for Microsoft Lync, including mobile clients.

• Uses SIP as the basis for its communication protocol with the client

• Offers support for TLS and SRTP to encrypt and protect signaling and media traffic

• Allow file sharing

• Collaboration through whiteboard documents, where participants are free to share text, drawings and graphic annotations.

• Collaboration through PowerPoint documents, where participants can control and view presentations, as well as allow everyone to add text, drawings and graphic annotations.

• Survey lists, where the presenters can organize surveys and all the participants can vote and see the results.

• Desktop sharing, generally allowing participants to view and collaborate on a Windows screen

• Share Windows applications, by allowing participants to see and collaborate on a specific application.

All collaboration sessions are automatically defined as conferences, where clients can invite more contacts. Conference initiators (usually called "organizers") can encourage participants to act as presenters or demean them to act as assistants. They can also define some basic policies about what presenters and attendees can see and do. The deeper details of policy permissions are defined at the server level.

After the acquisition of Skype by Microsoft in May 2011, the Lync and Skype platforms could connect, but sometimes only after a long time of provisioning.