When you send instant messages (IM) in Hebrew between the Microsoft Skype for Business 2015 (Lync 2013) desktop client and its mobile client, the order of the Hebrew words in IM conversation is changed.
Resolution
To fix this issue, install the May 2, 2017, update (KB3191876) for Skype for Business 2015 (Lync 2013).
Note Lync 2013 was upgraded to Skype for Business in April 2015.