ESTOS MetaDirectory as of version 3.0 Professional must be installed on a server in the local network.ESTOS MetaDirectory as of version 3.0 Professional must be installed on a server in the local network.Microsoft .NET Framework 4.0 must be installed on the local computer.SwyxIt! Version 2011 R2 MP1 or later must be installed.Option “SwyxPLUSfor DATEV pro” Only : DATEV basis pro V 2.0 or higher with DATEV telephony basis V 1.0 or higher can be installed on the same computer as SwyxIt!.