But becuase the user does not know that their mailbox has been moved when they visit https://mail.company.com/owa they get an error that their OWA URL is out of date.
To fix this, and provide the user with the correct URL (https://outlook.com/owa/company.com) then you need to set the TargetOwaURL property of the Organization Relationship that you have configured for your Office 365 service domain.
Set-OrganizationRelationship name -TargetOwaURL https://outlook.com/owa/company.comNow when users login with an account that has been moved to the cloud they will be told that their mailbox has moved, and that they should visit https://outlook.com/owa/company.com.
Some organizations though have an issue with this URL - it does not mention the company name in the domain name bit, and a name such as http://webmail.company.com/owa would be preferred for mailboxes moved to the cloud. To present the user with this URL after they login to on-premises OWA or for a URL that you can just tell them to use you need to do two things:
- Create a CNAME record in DNS for webmail that has outlook.com as the target FQDN. The CNAME record can be anything that is not already in use for the domain (for example it could be mail if that is not in use).
- The TargetOwaURL property of the Organization Relationship needs to be http://webmail.company.com/owa. The TargetOwaURL must finish with /owa or the on-premises OWA redirect page will error and the domain name used must be the domain name in your login name.