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> I just bought a IMAC and had Office 365 installed
Normally, the preinstallled Office 365 is for free trial not for permanent use.
However, please double check your copy to make sure is already licensed or not.
If you want to purchase Office 365, you need to have Microsoft account (any free email address provided by Microsoft such those of outlook.com, live.com or msn.com. Then you may go to office.com to buy and install online.