Windows 10: How can I move WORD documents from defunct account to new account

My son was one user of my multi-user Office 365 account to create WORD documents. I closed that account when he moved home. He paid for a new account on his own. He can still view the old items he created under "my" account but cannot find a way of moving them to his new account ... other that typing them all out again, which would be a massive task. Is there a way of doing this? Thanks for any help.

:)

 

How to remove defunct Email Address from Account

It is normal to get a code like that for two-step verification.

You should be seeing this below from the link I posted above after signing in with your Microsoft account.

This is where you can manage your aliases for your Microsoft account.

 

Remove account

I suggest you backup your personalized files first before removing the account.
To delete an account, follow these steps:

1. Press WIN + X keys and click Command Prompt (Admin) from the menu.
2. Type the following command and press Enter. Replace test with the name of your sister's account. Code:

 

Strange Windows 10 User Account issue.

Unfortunately I had done those steps numerous reboots, it just, reappears for no good reason. The base account isn't even a Microsoft account, it's a local account.

I haven't quite tried the built in administrator account on W10, but so far in my experience on my own computer, the built in account seemed to have absolutely no more control than I did on my own.

It's just strange, I go in, it warns me twice about deleting the account, then it's gone. Reboot, and it's back?

EDIT: Just to specify, both command line and Netplwiz both say only HIS account exists on the computer, it doesn't list this rogue account. This is what I meant in my first post about the fact that even Windows doesn't seem to believe it exists, HALF the time. *Frown