Well, no they don't. They can drop any legacy client whenever they wish. Microsoft could even try to make it sound like they're doing a good thing by removing unmaintainable legacy stuff they inherited from Skype.
Microsoft is not really required to maintain backwards compatibility with Skypes legacy stuff. It is possible they updated the Linux client for exactly this reason; update what you can, depreciate the rest for the good of everyone else.
Well, no they don't. They can drop any legacy client whenever they wish. Microsoft could even try to make it sound like they're doing a good thing by removing unmaintainable legacy stuff they inherited from Skype.
Microsoft is not really required to maintain backwards compatibility with Skypes legacy stuff. It is possible they updated the Linux client for exactly this reason; update what you can, depreciate the rest for the good of everyone else.