LanTalk NET 

LanTalk.NET Enterprise instant messenger. In fact, in most companies LanTalk.NET replaced corporate e-mail for exchanging files and messages. And the phones are ringing much less often.
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Akeni Enterprise Instant Messaging LDAP 

Akeni Enterprise Instant Messaging IM is an enterprise messaging system that offers strong encryption, along with Active Directory / LDAP integration. Features includes IM chat, conference, file transfer, notification, alerts, optional web client.
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