In some instances OPC Inbox will display an error message stating "No accessible overloaded ...", this can be resolved by following the steps provided below:


1) OPC Inbox requires SP1 for .NET v1.1. This can be downloaded from 

2) OPC Inbox should be ran as an administrator for best usage. 

If this solution does not work, or if you expirence dificulty please do not hesitate to create a Help Desk Ticket from