That is because OpenSync does not run as a Windows service. A decade of development against the QuickBooks desktop API has brought us – and many other developers – to the undeniable conclusion that the QuickBooks desktop API is simply not reliable when talking to it via a native Windows service environment. Consequently, we decided to roll our own service module – OSRunner.exe – you’ll find it listed in your Task Manager any time the OpenSync automated service is activated.

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