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Use different email address to login Office 365

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Use different email address to login Office 365

Postby guest » Wed Mar 04, 2015 10:30 am

We setup DirSync and ADFS to sync our Active Directory to Microsoft Office 365 for accessing email. That works. However, we have two email Doman names. for example ABC.com and DEF.com. We are loging in using abc.com to office 365. Can we also use def.com to login? If so, how?
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Re: Use different email address to login Office 365

Postby guest » Wed Mar 04, 2015 10:30 am

It is possible to deploy multiple domains SSO to Office365, but you have to modify existing Federation Trust configuration in order to support multiple domains. You can use same Active Directory Database and same Dirsync if these 2 domains are belong to same AD Forest. however, if the domains are in different forest, Please refer to below documents to configure Multi-Forest Directory Sync with Single Sign-On

https://msdn.microsoft.com/en-us/librar ... 10976.aspx

https://msdn.microsoft.com/en-us/librar ... 10975.aspx



To deploy SSO to support multiple domain(in your case, 2 domains):
Here is ths steps:
1. If you are using ADFS2.0, please install Update Rollup 2 for ADFS 2.0
http://support.microsoft.com/kb/2681584

2. Make sure the second domain has been added to the UPN suffix list in your Active Directory , verify that the user account has the second domain suffix for their AD account(you can check it in Active Directory Users and Computers->user’s properties ->account tab->user logon name)
3. Logon to ADFS server, open the ADFS 2.0 Management Console. Expand “Trust relationships” and select “Relying Party Trusts”. Now delete the “Microsoft Office 365 Identity Platform” trust.
Important
Once you delete this trust users using the existing UPN will not be able to access any Office 365 services until we issue the next command. So, please consider to do it in non-business hours.

4. After deleting the trust, open Azure powershell and then Connect-MsolService
5. update the first domain using below command:
Update-MsolFederatedDomain –DomainName “firstdomain.com” –SupportMultipledomain

6. Convert the second domain to federated using below command:
Convert-MsolDomainToFederated –DomainName “seconddomain.org” –SupportMultipledomain
7. Update the second domain
Update-MsolFederatedDomain –DomainName “seconddomain.org” –SupportMultipleDomain
8. Now you can test if the second domain suffix can be redirect when login to office365
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Re: Use different email address to login Office 365

Postby blin » Wed Mar 04, 2015 10:32 am

Please follow these links:
How to add alternative UPN suffixes in Windows Active Directory - Step by step with screenshots - http://www.howtonetworking.com/domain/upn1.htm

How to change domain login UPN in Active Directory - Step by step with screenshots - http://www.howtonetworking.com/domain/domainlogin1.htm
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