All SAP Business One versions are tested with the Windows Server and MSSQL patch level at time it was released.
SAP will not be able to perform any test or certification of on-going Windows Server and MSSQL updates, reason being it is random and too frequent.
SAP will only perform certification of the Windows Server and MSSQL patch level with the recent supported SBO releases, i.e. version 10.0. User can consider upgrade to the latest version.
Please note many of the on-going updates on non-recent Windows Server and MSSQL version, eg. Windows Server 2016 and MSSQL 2016 are related to windows operating system and network. Such changes may or may not affect SAP connectivity, however these are considered Windows permission and/or network issue, not an application issue.
In most case, we recommend client who are using an older version of the SAP keep the same version and patch level of the Windows Server and MSSQL. User can deploy the latest Windows Server or MSSQL patch however will need to uninstall if it breaks SAP connectivity.