My wife is literally in tears over the repeated loss of e-mails from her Windows Live program. I'm convinced that the problem is related to this mysterious "synching." She still uses a Windows 7 laptop occasionally and consults the Community now and then from that computer.
Here is my very important question: Is it possible to convert her Windows 10 logon to a "local account" that will behave exactly as it would if it were on Windows 7? She could do her normal computing (e-mail, Facebook, and some document writing and printing) but would have to log on to her Microsoft account in order to use the Microsoft Store or access the cloud. But, and this is the critical point, any mail on her Windows 10 laptop would stay there unless and until she moved or deleted it!
If it's possible to convert her logon to a local account on Windows 10, please tell us how.
Thanks very much.

Addendum: Alternately, is there something she can do on her Windows 7 laptop to prevent if from being synched with the Windows 10 computer? If the only solution is to delete the user account and give up use of the Windows 7 pc she would be willing to do that!

This is a really serious issue. We will be eternally grateful for a solution.

PS: I don't know if this is relevant, but she also uses an Android smartphone, and only very rarely reads e-mail on it. This has never been a problem in the past as the Android does not remove the mails from the server.

PPS: It also occurs to me that the Windows Live Mail program on the Windows 7 laptop is still using the POP3 format and deletes mail after it has been downloaded. Is there a possible solution here also?