Forum Discussion

StefanKi's avatar
StefanKi
Iron Contributor
Jul 28, 2020

Exchange Migration PST Export

Hello, I have a very bad exchange. The Exchange server barely works. The contents of the mailboxes should be migrated to Office 365. Because I can't configure anything on the Exchange Server I want...
2013
exchange online
office 365
StefanKi's avatar
StefanKi
Iron Contributor
Jul 28, 2020

Hi HidMov 

 

thank you for your answer.

How can I create an online mailbox (step 2) for the users?

In the UI of O365 I get this message

 

This user's on-premises mailbox hasn't been migrated to Exchange Online. The Exchange Online mailbox will be available after migration is completed

 

in step 3 I want to change the MX records. But for step 2 I already need the mailbox for the users in Exchange online. The users should use this online mailbox only after step 2 is finished until then they should use the onpremise mailbox.

 

 

 

 

DeepakRandhawa's avatar
DeepakRandhawa
Iron Contributor
Jul 28, 2020
run below and assign licenses and you should be able to create mailboxes in O365 :-
Set-User Jon@contoso.com -PermanentlyClearPreviousMailboxInfo
Ref:- https://techcommunity.microsoft.com/t5/exchange-team-blog/permanently-clear-previous-mailbox-info/ba-p/607619

also you can set up mailflow connectors between on-prem and O365 and migrate users in batches, below article explains how you can set up a criteria based mail routing:-
https://help.bittitan.com/hc/en-us/articles/115008260168-How-do-I-set-up-mail-routing-on-Office-365-when-migrating-users-in-batches-
  • StefanKi's avatar
    StefanKi
    Iron Contributor
    Jul 28, 2020

    Hi DeepakRandhawa 

     

    thank you for your answer.

     

    Do I have to stop AD Connect and make changes to the user before?

    Set-User Jon@contoso.com -PermanentlyClearPreviousMailboxInfo

    Output with AD Connect activated

    The command completed successfully, but no settings of 'Jon' were changed.

    • DeepakRandhawa's avatar
      DeepakRandhawa
      Iron Contributor
      Jul 29, 2020
      you don't need to stop AD Connect, try this for a user for which you are getting the error :-
      This user's on-premises mailbox hasn't been migrated to Exchange Online. The Exchange Online mailbox will be available after migration is completed
      and then reassign a license.
      • StefanKi's avatar
        StefanKi
        Iron Contributor
        Jul 29, 2020

        DeepakRandhawa 

        I applied it to a user created with ADConnect. But always get the above warning and no change to the user.