And according to a blog posted by Microsoft, some users are having problems with group calling, while others are experiencing delays adding users to their friend list.
While Skype Support has since tweeted that the problem has been resolved, this does not appear to be the case.
[UPDATE Aug 11, 2017 GMT]: The issue has been resolved.
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A group of cyber criminals has claimed that they are behind the attack, but this is yet to be confirmed by Microsoft.
CNET has referred to tweets by a group of cyber criminals, called Cyber Team, who tweeted: 'Skype down by Cyber Team.
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