Looking for Chatting App that runs on Mac, Windows and Mobile Devices

Hi,
 
 I am looking for the chatting software that meets the following requirements:

 (1) It should run on Windows, Mac and Smart phones.
 (2) Only inter-office users would be allowed to use  the app. Skype would be a good fit except users can include/invite anyone in the world who runs Skype.
 (3) When the message is arrived, it will popup in a window or provide an alert with audible sound.
 (4) Fyi, there is Outlook with Exchange already for the users. The reason for this chatting app is to let the users chat with other users on trivial stuff that don't need to be saved in Outlook/Exchange server.

 
 I welcome commercial software as well.
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sgleeAsked:
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Bill PrewCommented:
I have only used there customer version for personal use (which I like), not the enterprise version, but you might take a look at Trillian for Business and see if it is a fit.



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sgleeAuthor Commented:
@Bill,

  it is a good product. Thanks for the information.
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Bill PrewCommented:
Great, hope that works out well for you.


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