This indicates an Original Equipment Manufacturer license. It means the software was pre-installed by HP at the factory. These licenses are legally tied to that specific hardware and cannot be transferred to a different computer.
“OA”是“OEM Activation”（原始设备制造商激活）的缩写。在意大利 HWUpgrade 技术论坛上，社区成员确认了这一点：OA 标识代表的是预装在设备上的 OEM 许可，属于 OEM SLP（System Locked Preinstallation）授权类型。 windows 7 starter oa latam hp
If the hardware is still functional, replacing Windows 7 Starter with a lightweight Linux distribution is highly recommended. Distributions such as , Xubuntu , or Puppy Linux consume fewer system resources than Windows, receive modern security updates, and can breathe new life into vintage HP hardware. This indicates an Original Equipment Manufacturer license