Free im server software for windows

Selenium Server gives you the opportunity to create your own FTP or WEB server in a few clicks.

Wildfire is an enterprise instant messaging (EIM) server dual-licensed under the Open Source GPL and commercially. It uses the only widely adopted open protocol for instant messaging, XMPP (also called Jabber). Wildfire is incredibly easy to setup and adminster, but offers rock-solid security and performance.
Use Wildfire in your organization as a more secure and feature-rich alternative to the consumer IM networks. Or, replace your existing EIM server with a more open, easier to use, and much less expensive solution.
Enterprise Grade
Wildfire supports SSL/TLS encrypted connections out of the box as well as packet auditing to meet compliance requirements. Optionally tie Wildfire into your organizations existing authentication system such as LDAP and then handle thousands of concurrent users on a single server.
Open Source and Open Protocol
Wildfire is available under the Open Source GPL or a commercial license. It supports the open XMPP (Jabber) IM protocol and popular extensions. XMPP is supported by dozens of IM clients and allows for easy federation between IM servers. Wildfire is among the most compliant XMPP servers available.
Cross-Platform
The server can be intalled as a standalone application or service, or deployed in any J2EE compliant application server (Tomcat, Resin, etc) as a WAR (Web Application Archive).
Easy to Use
Get Wildfire up and running within ten minutes. Then, administer the server using the web-based admin console.
Plugins
The server is easily extensible with a full plugin architecture. Visit the plugin library for a full list of available plugins.
Spark IM Client
Wildfire works great with the cross-platform, feature-rich Spark IM client. Use the Spark Manager server plugin to manage the Spark clients on your server.
Server-Managed Contact Lists
Define groups of users in the server and then use the shared-group feature to automatically push those groups into users contact lists. This makes it very easy for people to start using the system and find the people they work with.

Server Watchdog is a free widget that displays the server uptime and response time for your servers registered with the Watchdog Service at AboutMyX.com.