i'm using MAG8000 OPC server but since i instal Windows 8 it stop communicating with my pop3 account.

Is there any problem with this version 3.0 and Windows 8?

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Split from MAG8000 OPC Server to SCADA communication.

It has never been tested under Win8, but I can't imagine that it won't work.

There haven't changed that much under the hood from Win7 to Win8.

You probably need to add the retrieval tool to the exclusions of the windows firewall.