OE at home set up for both our accounts shows all our emails.
It does not matter when using webmail which account I use to log on with either him@... or me@... it red ...
My other half and myself have email addresses i.e. me@home.freeserve.co.uk and him@home.freeserve.co.uk. We both have the same password.
Never had any problems when logging on from home using Outlook ...