Charlie Osborne/ZDNET Follow ZDNET:  Add us as a preferred source  on Google. ZDNET's key takeaways NordVPN is rebuilding its VPN app to combine VPN service with modern threat protection. The rebranding focuses on three pillars of a personal security strategy: connect, protect, and monitor. NordVPN's transition highlights the wider trend of VPN providers expanding their security portfolios.  Is the term "antivirus" outdated? According to Virtual Private Network (VPN) provider NordVPN, it appears so -- and this belief has laid the foundation for change within the company's portfolio.…