How to connect to PPTP VPN server from a Windows machine (Windows 7 as an example)

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For some reasons, you may need use VPN service.  If you do not have a VPN provider, you can install your own PPTP VPN server on Linux machines in about 5 minutes. This post gives step-by-step guide on how to install and configure a PPTP VPN server  on Redhat, CentOS and Ubuntu. It should also ...