When running, MG-SOFT's SNMP Master Agent will properly respond also to received SNMPv2c and SNMPv3 requests. By default, the SNMPv3 protocol is configured to run in the noAuth/noPriv mode. However, by adding a few additional registry keys, you can configure it to run in any other SNMPv3 security mode. 

Subagents are completely un-related to the SNMP version spoken by the master agent and they don't require any modifications when the SNMP protocol version in the master agent is changed. There is no need for any modification in the existing extension DLLs, i.e., the same binaries that are used with Microsoft's agent will run also with MG-SOFT's agent.

MG-SOFT SNMP Master Agent Configurator

For example, MG-SOFT's agent provided on the Internet for the SNMPv3 interoperability testing is running on Windows XP computer and is using the standard Microsoft's inetmib1.dll extension dll, binary file distributed with various versions of 32-bit windows OSes (i.e., MG-SOFT doesn't have source code for the extension dll to change or re-compile it. It runs with MG-SOFT's SNMP Master Agent just as Microsoft provided it).

The main advantage of MG-SOFT's SNMP Master Agent over Microsoft's SNMP Service is that MG-SOFT's SNMP Master Agent supports SNMPv1, SNMPv2c and SNMPv3 protocols, while Microsoft's SNMP Service supports only unsecure SNMPv1 and SNMPv2c protocols.