public folder migration

Question

Hello,

I am performing a Public Folder Migration from my Exchange 2019 server to O365.

I am going through this article to meet all my prerequisites.

But I am stuck at adding a new accepted domain (Step 2).
Why is this article asking to create a new accepted domain with this particular name?

If the accepted domain already exists in your on-premises environment, rename it to PublicFolderDestination_78c0b207_5ad2_4fee_8cb9_f373175b3f99 and leave the other attributes intact.

https://learn.microsoft.com/en-us/Exchange/collaboration/public-folders/migrate-to-exchange-online?view=exchserver-2019#prerequisite-steps-in-the-on-premises-exchange-2013-exchange-2016-or-exchange-2019-server-environment

I already have domain.mail.onmicrosoft.com added as my accepted domain, still asking to change the name??

Any ideas if you have performed the migration and noticed this part????

Thanks in advance!!

Answer 1

Hey Jason, if it already exists then follow. All you are doing here is changing the name, not the domain name itself.

If the accepted domain already exists in your on-premises environment, rename it to PublicFolderDestination_78c0b207_5ad2_4fee_8cb9_f373175b3f99 and leave the other attributes intact.

Get-AcceptedDomain | Where {$_.DomainName -eq "<target domain>"} | Set-AcceptedDomain -Name PublicFolderDestination_78c0b207_5ad2_4fee_8cb9_f373175b3f99

Answer 2

ok this will not break any mail flow or existing PF access?

"I am dealing with a very sensitive client here" :)

Also I see the article makes reference to creating internal relay type connector. Mine appears to be authoritative. Does this matter?

Answer 3

I'm also confused by this step.

The primary step is to create a new accepted domain of '*.mail.onmicrosoft.com' and only rename if the domain already exists.
This domain is created by default in a hybrid environment so I cant see how it could ever not exist. So why do Microsoft say try to create it first?

Also, if it didnt exist and we did create a new domain, this new domain would only be present in Exch on-prem and wouldnt exist in EXO. If this domain is for routing purposes to EXO I dont understand how creating a new domain would work? Nowhere does it say the domain must be added to O365 and to the hybrid config.

Can anyone clarify this?

I'm also concerned about renaming the primary domain in Exch on-prem and changing from Authoritive to Internal Relay
Any thoughts?