I have a lumia phone and this includes a live.com email account, which I cannot seem to delete.

The live.com email account wishes to update security every month. In doing so  it seems to override my access to other more important email accounts on the phone by continuously requiring attention. By more important I mean work.

Why cannot I simply receive a message to attend to the account?

It asks for aanother email account to send a security code to. Whay does that take one month? Givning even less reason to use live.com.

Why can't I delete live.com from the phone?