If you already redeemed an Office product key, reinstalling on a new Mac is not mainly about typing the key again. It is mainly about the Microsoft account tied to that redemption.<\/p>\n
That is why the first safe question is not ‘Can I use the same key again?’ but ‘Which Microsoft account owns this Office install, and does the move fit the license terms?’<\/p>\n
Short answer<\/p>\n
Yes, you can sometimes reinstall Office on a new Mac after redeeming the product key, but the normal path is to sign in with the Microsoft account associated with Office, not to treat the redeemed key like a fresh unused code. Microsoft’s install guide says that once the key is redeemed, the account tied to Office is used to install it again, while its activation guidance says one-time Office installs are licensed for one computer and cross-device transfer must follow the transfer terms, with uninstall from the original computer and phone activation when required.<\/p>\n