I am prepping to perform the process listed here "Configure legacy on-premises public folders for a hybrid deployment". Step 4 indicates that you should run Sync-MailPublicFolders.ps1 -Credential (Get-Credential) -CsvSummaryFile:sync_summary.csv If I understand the process correctly, the Office 365 mailboxes are accessing the public folders directly on prem so I am confused at to what exactly is synchronizing when you run the Sync-MaillPublicFoders script?

Hey there All that does is sync the PFs as mail-enabled objects so they can be seen in the Outlook GAL by your Exchange Online Mailboxes. It also allows you to give send as permissions for 365 mailboxes to those objects that represent the PFs - as well as make them "viewable" by any transport rules you may create in Exchange Online. Note that they will show up as contacts in Exchange Online, not public folders. Its not absolutely required that you sync these by the way. Your Exchange Online mailboxes will still be able to access the on-prem Public Folders even if you dont do this step.

Syncing on Premise Exchange 2010 Public Folders to Office 365

Accepted answer

Andy David - MVP 147.3K Reputation points MVP

2020-12-31T21:03:35.97+00:00

Hey there
All that does is sync the PFs as mail-enabled objects so they can be seen in the Outlook GAL by your Exchange Online Mailboxes.
It also allows you to give send as permissions for 365 mailboxes to those objects that represent the PFs - as well as make them "viewable" by any transport rules you may create in Exchange Online.

Note that they will show up as contacts in Exchange Online, not public folders.

Its not absolutely required that you sync these by the way. Your Exchange Online mailboxes will still be able to access the on-prem Public Folders even if you dont do this step.
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jpcapone 1,396 Reputation points

2020-12-31T21:11:52.65+00:00

Ah so I would have to run
New-AcceptedDomain -Name "PublicFolderDestination_78c0b207_5ad2_4fee_8cb9_f373175b3f99" -DomainName contoso.onmicrosoft.com -DomainType InternalRelay

in order for email to be accepted by the mail enabled public folders from Exchange Online Mailboxes?

Andy David - MVP 147.3K Reputation points MVP

2020-12-31T21:21:40.967+00:00

You wouldnt do that here as that is run when migrating on-prem PFs to Exchange Online. In your scenario, the public folders will remain on-prem.

If you decide not to synchronize the on-prem public folders to Exchange Online, then you would need to ensure the Exchange Online accepted domain(s) are set to internal relay so that any external messages to on-prem mail-enabled public folders are routed correctly to the local Exchange Servers, but you wouldnt run that command rather you would run:

Set-AcceptedDomain <yourdomain> -DomainType InternalRelay

But this would be set in Exchange Online, not on-prem in that scenario.

jpcapone 1,396 Reputation points

2020-12-31T21:47:06.773+00:00

Thanks again!!
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Syncing on Premise Exchange 2010 Public Folders to Office 365

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