Using a large number of domains with Office 365

Typically, you can add up to 900 domains to your Office 365 subscription. Under the following circumstances, the limit might be lower:

  • Skype for Business Online has a limit of 600 SIP domains. While you still can add up to 900 domains to Office 365, only 600 SIP domains will be available for use with Skype for Business Online.

  • The following scenario is unlikely, but good to keep in mind if you have a large number of Office 365 domains. Verified domains are stored as tenant-specific information, and there is currently a limitation as to how much tenant-specific information Office 365 can store for a given tenant. Using various Office 365 features can contribute to this limit and prevent you from adding 900 verified domains to your tenant.

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