MS on How to use external users in SharePoint Online (with a cost-free Azure Active Directory)

Toni, thanks so much. I think this is the solution I was looking for. The portal.office.com for resetting passwords looks great, I thought I was going to need a paid AAD plan to do that. Regarding the unique email address, I noted that also. A workaround can be to use a gmail account, they allow you to place periods (.) anywhere in the username. Using this you can fake out Sharepoint using "usernam.e@gmail.com", then "userna.m.e@gmail.com", etc.