Microsoft acknowledged that the Skype is down, and they are currently investigating this.
Skype is not working for millions of users from the entire world. Currently it’s not possible to login to your Skype account. If you are already logged in, it will be set to “offline” automatically. If you’re trying to use Skype from web, you will see a “sending”, and not completed emoticon.
Skype was reported that stoped working around 1:00 UK time. This starts to be more and more frustrating for Microsoft users.
Users already tried to report this issue on the Microsoft forums, but so far, there is no update on this, from Microsoft.
There are some other good solutions as Skype replacement, like: Slack, facebook, email.