Create-Mailbox is only creating mail contact and not the mailbox. Enable mailbox give me an error "ExternalEmailAddress is mandatory on MailUser. Property Name:ExternalEmailAddress+ CategoryInfo "

[Rudi2]

Create-Mailbox issues: is only creating mail contact and not the mailbox. Enable mailbox give me an error "ExternalEmailAddress is mandatory on MailUser. Property Name:ExternalEmailAddress+ CategoryInfo "

has anyone used these for onsite exchange and its working? which parameters should match between AD user creation and mailbox creation? 

Thanks

[Rudi2 · Accepted solution]

I have achieved this my changing one of the Exchange OOB powershell commands after getting errors about the exchange cmdlets and used the following command:

I copied and changed the Set-Mailbox mid server script and I have added parameters to add the user itself into the correct OU with a few details. I then created a custom powershell activity to update the AD user again with all the details you can fill in on the portal. love it when you can only do 1/4 of what you want with the OOB activities.