There's no migration path from Skype to Microsoft Teams (Personal). Microsoft hasn't picked one as far as I know.
Microsoft similarly has a bunch of duplicate services and products. They've got chat functionality spread across many apps, specifically Teams, Skype, and Xbox. Windows also has widgets in Windows 11 and widgets in Xbox Game Bar. There's also the mess that is developing apps for Windows that has just become Chromium, partially due to Microsoft's own messes.
Microsoft similarly has a bunch of duplicate services and products. They've got chat functionality spread across many apps, specifically Teams, Skype, and Xbox. Windows also has widgets in Windows 11 and widgets in Xbox Game Bar. There's also the mess that is developing apps for Windows that has just become Chromium, partially due to Microsoft's own messes.