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I cannot open a new document or edit existing ones on my iMac. Works fine on my MacBook Pro. I am running Big Sur on the iMac
A family of Microsoft word processing software products for creating web, email, and print documents.
Big Sur is no longer supported by Apple so Microsoft support for Office on Big Sur has been withdrawn.
The odds are that the MBP is running a more current version of macOS.
To run Microsoft Office, you'll need macOS 12 or later. See https://www.brandwares.com/bestpractices/2023/03/most-recent-office-you-can-run-best-practices/ .