Hi, we want to use a single exchange 2013 standard deplyment to host emailboxes for 10-20 small companys. The issue I have is how can i make 2 user with same usernames so they can log in to owa with their emailaddresse? I have added the domain as upn-suffixes. I am aware that a user can't have the same username in the same domain, so how can I solve this? I get to the point to make f.ex post@company1.com and post@company2.com but I can't log in with this in the OWA since it is not the primary UPN-suffix since it can't have the same prefix. I need the users to login with their emailadresse or else it would be to much support I think. Is there any solution to this? To use a 3rd controlpanel would bring up the expenses to much.

Hi, The only way to do it is to create multiple domains in your forest. Otherwise u cant have two users with the same username.

Hi, The only way to do it is to create multiple domains in your forest. Otherwise u cant have two users with the same username.

so to host multiple customers in exchange I need to create a domain for each company/customer if they want to be able too login with the same prefix but different suffix?

Yes, there is no other way.