Skype has just announced that it's set to retire older versions of Skype for Mac along with those of Skype for Windows.

According to a new blog post by the Microsoft-owned VoIP company, Skype for Mac 6.14 (which was released last February) and older versions are going to be retired over the next few months.

As reported by Computerworld:

Skype did not spell out what it meant by “retire” in the blog post – whether the older software will simply not be supported or that only the most recent versions will work with the network – but Microsoft clarified the situation. “Once a version is retired, users will no longer be able to sign into the retired version until they upgrade to the latest version of Skype,” a Microsoft spokesperson said in an email reply to questions.

In line with this, users are encouraged to upgrade to the latest version of the desktop video-calling and instant messaging client ahead of the retirement of its earlier editions.

Skype touts the following key features of the latest version of Skype for desktop: sending and receiving messages to and from offline contacts, viewing complete chat history across devices, and cross-device syncing the read/unread status of messages.

The current version of Skype for Mac is version 6.18. Compatible with OS X 10.9 Mavericks and later, the app can be downloaded for free from Skype's official website.

Over the past couple of weeks, Skype updated its official iPhone app with a new design and a number of significant improvements.

Skype for iPhone is available on the App Store for free, as is Skype for iPad.