Symptoms
When you receive an HTML message that contains a malformed DOCTYPE tag (for example, <!DOCTYPE doc [) in Microsoft Skype for Business 2016 or Skype for Business 2015 (Lync 2013), the client consumes high memory and finally crashes.
Resolution
To fix this issue, install one of the following updates:
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For Skype for Business 2016, install the April 3, 2018, update (KB4018323).
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For Skype for Business 2015 (Lync 2013), install the April 3, 2018, update (KB4018334).
Note Lync 2013 was upgraded to Skype for Business in April 2015.