Our organization has a remote employee that works at a client's site. Her PC is supplied by the client and runs MS Office with Outlook. She has an email address on the client's domain. She also has an Exchange Online (Plan 1) account that I set up through our Office 365 Admin Center.

The client's IT policies have the Outlook desktop application set so that she cannot add another Outlook "Profile". However, she can add another account to Outlook. So I'm wondering, if she adds our company's email address to her Outlook desktop app':
- Will she have separate inboxes for each account or will the mail be mixed together into one inbox?
- Will she be able to select which account to send mail from?
- When replying or forwarding, will the From value default to the account to which the mail was originally sent?
- If we choose to add our company's email account to the client's Outlook desktop app' then what Account Type do we select during the add account setup (Office365, Outlook.com, Exchange, POP, or IMAP)? We would want all our company's email to remain on and sync'd with her Exchange Online account.

Thanks in advance,
Andrew