The 'app' part of it is just the GUI (the Antimalware Client). MSE still gets the latest updates for the scan engine and the AV definitions, exactly...
You can find ISOs of Office 2000 in the Internet Archive. Make sure you get the edition that matches your key, it will only work with the edition it...
I also have W7 Pro on my System Two, and several W7 Hyper-V VMs. My other machines run Windows 10/11. Their specs are in my Ten Forums & Eleven Forum profiles.