Windows 10: i have two emailaccounts and now two Microsoft accounts - too confusing

In W10, I have two email accounts and now have two Microsoft accounts - too confusing, how can I resolve this on 2 computers and phone

:)

 

User Account Confusions

Certainly am ! First to uninstall Malwarebytes and disable Secure Boot. Then I am good to go.

Left starting until I could get a clear run,


DOWNLOADING ISO
I am confused by the Download Menus which suggest downloading twice which is fine but in
between seems to suggest downloading and UPDATING Windows 10. I seem to remember being warned at some stage updating Windows could cause confusion. Should I ignore this Dialogue - menu - step and proceed straight to downloading from the Microsoft site ?

Also I need the mouse to work efficiently is it ok
a) to leave it in and/or
b) to remove it an put it back during the Repair install ?

The touch pad is unreliable and only seems to work intermittently,

 

Microsoft Accounts confusion and Outlook confusion

A) Account confusion:

I had to re-install Windows 10 and Microsoft 365 for the third time as for various reasons my new PC had to be reset to factory settings twice. Having a MS account using my e-mail address (call it here) #1 at the 3rd install was not accepted. Trying #2
was also rejected so I used #3.

• #3 now shows up on the Win10 opening screen. Trying to change it to just my name so far didn't work.
  
• #2 shows up under C:\User\ (probably via another entry - as not quite correct thus my error) but it was rejected at that stage of setting up Windows and
  
• #1 when signing in shows my purchased products and my personal information.

Does that mean I have 3 accounts with MS? And why was my #1 account rejected in the first place when re-installing Windows. Also there is constantly an indication that I should install Microsoft 365, which is installed, This is probably related to this
"3-accounts" confusion. How can I fix all this and have just ONE, preferable the one I sign in with?

B) Outlook confusion.

I found out the hard way that MS has two different "Outlook" products. One with Win10 and a more capable version with MS 365, the one I like to use. Yet installing Win10 I am forced to open an "Win10 Outlook" email account. Why can I not skip that? I can
see the reason for registering but that shouldn't include an opening of a Win10 Outlook email account. Now I have to find out how to delete the one I was forced to open and how to switch to the other "Outlook" which comes with MS 365 so I can set up my existing
e-mail accounts - Having the same name for two, albeit similar products only adds to the confusion. Last time a friendly MS employee took over my PC and fixed it. I have no idea what she did to do so nor have I found any guidance. There should be no need
for a fix. Win10 customers should not be forced to open a "Win10 outlook" email account. I like and have used Outlook (from and Office (now Microsoft) product) since I started using e-mail but I like to use the one which is part of Microsoft 365. Previously
used Office 2010, 2013 and 2016. Where can I find
a step-by-step instruction how to fix this. (Unfortunately I am way up in the 80's and am no longer the neighborhood computer expert I once was called so I need help)

 

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: