It is possible OEMs will begin receiving Microsoft Windows 10 in July, so they have time to prepare the OS for a summer launch to consumers. Windows 10 has been promised sometime this summer, and an exact release date was never released - but Russian leaker Wzor reportedly said the Windows 10 RTM will begin shipping by the end of July.
RTM is an acronym that points out the release to manufacturing, which is the OS version that PC OEMs use to test their hardware - and to install on PCs, notebooks, and other products that will be sold to consumers. A typical roadmap typically provides a couple of months between the RTM and final consumer release, so any bugs and early issues can be quickly worked out.
Here is what Microsoft told CNET: "Microsoft has said Windows 10 will launch this summer. We have nothing additional to share."