Converting an email alias into it's own user account? Will emails be lost in transition?

[Test_Pilot]

I have an alias under my superadmin account that I would like to separate it into it's own paid user account.

I've read the instructions on going into the alias menu, deleting it, and then recreating it as a new user under "add a new user".

My concern is, when I delete the alias, will that users email be deleted even though it is being recreated as a new account?  Are these emails purged or held in stasis for a while allowing them to be rebuilt under a new user account name?