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Hi Dan Holmes,
Welcome to our forum!
Please try to repair Office Installation by the following steps:
- Open Control Panel > Programs > Programs and Features.
- Select Microsoft Office LTSC 2024 and click Change.
- Choose Quick Repair and click Repair.
- If the issue persists, try Online Repair (more thorough).
In addition, you may want to refer to the article step-by-step: I can’t start Microsoft Outlook or receive the error “Cannot start Microsoft Outlook. Cannot open the Outlook Window” - Microsoft Support
If all above do not work, it is suggested please uninstall Office via Control Panel and reinstall from the original source (Volume License, Microsoft 365 Admin, etc.).
Hope it helps.
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