Hi all,

Today, I received a complain from a user which was not receiving any emails coming from external…

So I checked his account and found that this user had a mailbox in the cloud but also in our Exchange environment ! Of course as the MX records are still pointing to the on-prem, all external emails came on the on-prem mailbox and never been forwarded to the cloud mailbox…

So the only solution I found was to export the on-prem mailbox as a pst using the command new-mailboxexportrequest then disable the mailbox (ensure to keep the proxy addresses and every ms exchange custom attributes before launching the command) and finally enable a mail user (report the proxy addresses and the custom attributes if needed).

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