Parlano develops chat software for enterprises with multiple offices and remote employees.
The company's MindAlign suite allows for users in multiple locations to set up chat sessions in a secure, encrypted environment.
Once the deal becomes official, Microsoft will integrate Parlano's technology into its Office Communications and Office Communications Server offerings.
Parlano will move from its headquarters in Chicago to Microsoft's Redmond campus and dissolve into the unified communications group.
Terms of the deal were not disclosed.
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