Free messenger IM between employees

Does anyone know a free good reliable messenger that will work between employees.

Just like Lync, but free.
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Dan CraciunIT ConsultantCommented:

I have it installed on a Linux VM and use Jitsi ( as clients, for video chat.

alonig1Author Commented:
Do I need to install the "server" or just clients?
Dan CraciunIT ConsultantCommented:
You need the server. The clients all connect to the server.

For the server, you need an always on machine (a VM with 1 GB RAM and 5GB of space is enough).
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alonig1Author Commented:
I have only two computers, I am looking for a free service to just register and go.
Dan CraciunIT ConsultantCommented:
You can use Skype, Y! Messenger etc. All free, all just register and go.

OpenFire is an option if you want to control the communication (meaning everything is stored by you).
We use Slack ( for instant message which has a free plan. There is no server to install, it allows some customization, and has both desktop and mobile clients.

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Nick WebsterCommented:
You could use good old yahoo messenger.
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