The third O-RAN ALLIANCE whitepaper extends the previous ones and outlines the alliance’s focus on several key areas to accelerate and enable the introduction of the rich capabilities of O-RAN Architecture in commercial networks and provides a minimum set of end-to-end specifications for selected use cases for the deployment of a secure, multi-vendor interoperable network. This whitepaper starts with the latest snapshot of O-RAN Architecture, followed by an introduction to the O-RAN Minimum Viable Plan (MVP) for prioritized delivery of a minimum viable set of end-to-end O-RAN solutions applicable in commercial networks using the input of Operator members. Additional use cases defined since the last use cases whitepaper are summarized in the subsequent section. The O-RAN Software Community (OSC) effort to help accelerate the realization of O-RAN vision through open-source projects is followed by the progress of Test and Integration Focus Group (TIFG) for testing and integration of multi-vendor O-RAN solutions through end-to-end test specifications, the guidelines for Open Testing and Integration Centres (OTICs) and the organization of global PlugFests. This whitepaper is concluded with the Security Focus Group’s (SFG’s) work in progress to ensure secure O-RAN through the development of a security architecture, enabling 5G service providers deploy and operate O-RAN with the same level of confidence as existing networks.