Skype for Linux was declared dead under Palmer's, resources reduced to a minimum and new versions and features blocked. Skype CEOs and CTOs at that time are equally responsible, made millions and disappeared. It's been an uphill battle since, you can found some linux developers on LinkedIn and ask them. A joke that goes around is that Skype could die soon this year unless it turns profitable. Anyway, from a business perspective MS doesn't understand or value Linux desktop, so nothing to be surprised here.