Nov 13 2021 11:06 PM
Nov 13 2021 11:06 PM
So I have migrated from Exchange OnPrem to Exchange Online.
Before migration I have taken a snapshot from the Exchange server, just in case.
Now, there is a user who claims that some of her contacts vanished during the migration. So I booted up the backup Exchange and tried logging into the OWA to see if I can find some cantacts there. However, when trying the OWA, using the localhost url I get redirected to the online Outlook. Obviously the Exchange server recognizes soemwhere in the AD that we have migrated.
So my question:
How do I access the old information on the OnPrem Exchange Server if I did not think of keeping a backup of the DC?
Nov 16 2021 05:36 PM - edited Nov 16 2021 05:37 PM
This is probably occurring because the account you are using has the targetaddress attribute pointing to EXO. I don't have any answers on how you get around that though. Depending on how mail is flowing and where autodiscover is pointing, the targetaddress attribute may be critical
Nov 17 2021 12:04 AM
Thanks for your reply
Do you at least have the information of the flow?
Say, first it checks DNS for the autodiscover, then it checks the autodiscover and checks to which server it points, then it looks at xyz etc.
If you know the answer it would also be helpful to hear what happens if it doesn't find the autodiscover or any other file along the way?
I do want to point out again that I attempted to login straight via the OWA on the (copy of the) Exchange Server itself, using "localhost" as the url. This server is supposed to be unaware of the migration, as it is a snapshot from before. So it doesn't really make sense to me that it would be looking for an autodiscover, which is used by a email-client to locate the server. The only thing it sould be checking is the username and password, which it is supposed to get from the DC
Thanks again for trying
Nov 17 2021 05:29 PM - edited Nov 17 2021 05:31 PM
If mail is flowing via the on prem Exchange (including anything being relayed), messages will be redirected as per the targetaddress attribute. This is the same for autodiscover. If mail is flowing directly to EXO, no on-premises apps or devices are relaying via on-premises Exchange, and autodiscover is pointing to EXO, then it's not a critical attribute.
For your access to the EAC, the OWA/ECP will check the value of the targetaddress attribute on the user AD object and redirect according to that value.
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