Specify a semicolon separated list of server version names, e.g. RTC/2.9;RTC/3.0;RTC/4.0, to which Microsoft Lync allows ...

Specify a semicolon separated list of server version names, e.g. RTC/2.9;RTC/3.0;RTC/4.0, to which Microsoft Lync allows logon in addition to the server versions that are supported by default. Space character is treated as part of the version string.