Microsoft Exchange was originally a corporate mail serving application. Did your mother have access to a company e-mail service? If not, as I suspect, you should create a new e-mail profile and use POP or IMAP to connect to the mail account.

Otherwise see https://support.microsoft.com/en-us/kb/2299468

__________________
Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com