Open Skype for Business or Lync and sign in.To turn on the option for storing chat history: Read this article for more information What Is An Autodiscover Record And Why Do I Need It? Note: Make sure that your domain has a valid autodiscover record.
This option is only supported if you are using Outlook as the Default mail client. You can store copies of your Skype for Business/Lync chat conversations in your Outlook to refer to later.