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Blue Tongue
Asked: 2019-07-03 03:35:10 +0800 CST

Office 365 migration where AD domain name is different to email domain name

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My present environment is such that the AD domain name is abc.com while the Exchange 2010 email address domain names are @abc.com with @xyz.com as the reply to address. We want to use xyz.com and @xyz.com in the long term.

We want to migrate to O365 using hybrid deployment, should we first migrate AD domain to xyz.com first or is there a shortcut?

Any suggestions will be much appreciated!

exchange-2010

1 Answers

  1. the Exchange 2010 email address domain names are @abc.com with @xyz.com as the reply to address.

    I'm assuming that you mean that each user has a [email protected] email address and a [email protected] email address and that the [email protected] email address is theur primary SMTP address.

    Add and verify xyz.com in your Office 365 tenant. Then add xyz.com as an additional UPN suffix in AD and set that as the UPN Suffix of all your AD user accounts. Then install and configure Azure AD Connect in Hybrid mode in your AD. Once the AD user accounts sync to Azure AD/Office 365 all your Office 365 users will have the UPN of [email protected] and will have the primary SMTP address of @xyz.com.

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