The latest Skype Insider build brings a new call screen, easier access to captions during calls, and all sorts of bugfixes and stability improvements, including a crucial fix for old Windows versions.
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Microsoft has begun rolling out Skype version 8.66 to all users that brings support for up to 100 call participants on all supported platforms. There is the usual suite of bug fixes as well.
Skype 8.64 is now rolling out to all users that brings the ability to customize the quick reaction for messages. iOS users can now share content with Skype contacts directly from the share sheet.