Solution for iCloud Outlook "wrong password" error, repeated requests for password in iCloud for Windows

After trying all previous suggestions, including messing with files in %appdata%, and a multistep process with iCloud and outlook, I've found that only two things work on my Windows system: a) uninstalling and reinstalling iCloud, which is very time-consuming, and b) the following list, which takes about five minutes once you get used to it.

This must be done every few months when Windows does a big update that breaks the cached iCloud Outlook add-in credentials.

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Update for October 2022, when a combined Windows/iCloud app update broke the previous solution. An earlier step of running iCloud setup "As Administrator" had to be resurrected

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1. Run iCloud setup as the logged-in iCloud user.

2. Un-check the "Contacts and Calendars with Outlook" option, apply and close.

3. Run Outlook, go to File / Options / Add-ins / Manage COM Add-ins / Go...

4. Disable the iCloud Outlook addin, close Outlook.

5. Run Outlook as administrator, disable iCloud addin as per 3&4 above.

6. Now /remove/ the iCloud addin, still as Administrator.

7. Close Outlook (may need to reboot -- feel free to try both ways).

8. Run iCloud setup as Administrator, enter password, confirm via 2fp

9. If iCloud will not run, then it needs to be updated as part of the Windows update, and requires a reboot.

10. In which case, reboot, and repeat step 8 above.

11. Check the "Contacts and Calendars with Outlook" option, apply and close.

12. Run iCloud setup as the logged-in iCloud user, enter password and confirm if needed.

13. Check the "Contacts and Calendars with Outlook" option, apply and close.

14. Run Outlook as administrator, go to File / Options / Add-ins / Manage COM Add-ins / Go...

15. Manually add the iCloud Outlook Add-in from the file in %ProgramData%, typically:

16. C:\ProgramData\Apple Inc\iCloud\Outlook\aplzod32.dll

17. Close options.

18. The iCloud outlook add-in toolbar icon will say "wrong password" instead of "refresh".

19. This is fine because Outlook was started as administrator and is using the wrong credential cache.

20. Close outlook.

21. Re-open Outlook as the logged-in user and it should now be happy and show "refresh".