v počítači nieje nainštalovaný Office, len MS Starter verzie

MS Starter verze říkáš Office Starter nebo čemu? Co to doopravdy hlásí?

The stand-alone Skype for Business client lets Microsoft Office 365 users run a current version of Skype for Business alongside of different versions of Microsoft Office products. For example, you could run Microsoft Office 2013 alongside Skype for Business.

https://support.microsoft.com/en-us/help/3139711/how-to-install-the-skype-for-business-basic-stand-alone-client