You can add multiple domains to Office 365, but each domain should have valid Internet domain suffix such as .com, .net, and .org.

Following are some examples of valid domains:

  • contoso.com
  • contos.co
  • contoso.net
  • contoso.us

Following are some examples of invalid domains and they cannot be added in Office 365:

  • contoso (Single labeled domain is not allowed)
  • contoso.local (Local domain is not allowed)
Valid Domains in Office 365
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Karim Buzdar

About the Author: Karim Buzdar holds a degree in telecommunication engineering and holds several sysadmin certifications. As an IT engineer and technical author, he writes for various web sites. You can reach Karim on LinkedIn

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