Configuring mailbox permissions on a hybrid setup

Really useful stuff here: https://cloudrun.co.uk/exchange-online/configure-exchange-hybrid-mailbox-permissions-during-migration-to-exchange-online/  

Run this In powershell/exchange :

 Enable-MailUser stephen.d –ExternalEmailAddress [email protected]

 run following in normal powershell or update via adsiedit.

Set-ADUser stephen.d –Replace @{msExchRecipientDisplayType = “-2147483642”}    (default was 6)

Set-ADUser stephen.d –Replace @{msExchRecipientTypeDetails = “2147483648”}   (default was 128)

Set-ADUser stephen.d –Replace @{msExchRemoteRecipientType = “4”}    (default was not set)