It seems like a never-ending story between the German government and Microsoft where the former tries to replace software made by the Redmond giant but fails to do so due to one reason or another. For example, back in 2017, the Munich government came back to Windows following the failure of its LiMux venture where it tried to embrace the open-source way of Linux.
In such a case, this time the government of German state Hesse (Hessen) tried to dump Microsoft Teams and Office 365, but unfortunately for the state authority, the Higher Regional Court Frankfurt am Main (OLG) ruled against such a decision.