Once upon a time Microsoft did something good. They added the ability to send SMS messages directly from Microsoft Outlook. It worked well in Outlook 2007 and 2010. But then, in Outlook 2013, they ended support for the feature because they said not very many people used it.
I’m not sure how they determined it wasn’t used very much, but apparently they didn’t see the outcry online when they discontinued it. Or they didn’t care when they did. Many businesses relied on the ability because it let them use a system they already knew – Outlook – and their existing contact information to send both emails and SMS messages.