But...But...But... AwareIM is NOT a US product!!!
I can understand why Salesforce, paypal and other applications that need to connect to a server could be blocked, but AwareIM does not require to "phone home". So as long as there is a local server to run it on, then all should be good. If they expect to access an application that is based in a different country, then it is important to make sure that the Cuban government does not block that URL. (I am sure there must be "friendly" countries to cuba that have servers.
But wait. As long as the customer in cuba has some sort of PC, (or mac, or linux) computer, they can certainly host the awareim app.
Bruce