A Microsoft file hosting and synchronization service.
Hello Lex,
Welcome to the Microsoft Community.
I am a Microsoft user, just like you.
On the old PC, unlink OneDrive. You won't lose files or data by unlinking OneDrive from old computer. You can always access your files on your new pc or by signing in to OneDrive.com.
Find link below to guide you unlink OneDrive: https://support.microsoft.com/article/office/f32a17ce-3336-40fe-9c38-6efb09f944b0
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Warm Regards