OOBE does not set the display settings as specified in the unattended file

Source: Microsoft Support

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You are deploying Windows Vista, and have specified the screen display resolution in the unattend.xml file. However, you may find that OOBE is not setting the display settings as specified in the file.

This behavior is as expected. MSoobe changes the screen resolution to the best available resolution, or the driver preferred resolution. The settings specified in the unattended file would not take effect.

You may configure the screen display setting after OOBE.

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