Microsoft Office Pre Activated =link= -
If budget is your primary constraint, consider open-source office suites. They are completely free, highly secure, and compatible with Microsoft Office file formats (.docx, .xlsx, .pptx):
A genuine license should be directly linked to your personal account at account.microsoft.com/services. microsoft office pre activated
If you are open to using software outside the Microsoft ecosystem, there are excellent free and open-source alternatives that are completely safe: If budget is your primary constraint, consider open-source