Sync specific public folders in exchange 2010 to Office 365? (Hybrid Config Setup)

Question

Our setup is EX2010/365 hybrid config, and I'm working on Public Folders. I'm planning to simulate a test public folder to sync to the Hybrid (Maybe 1 public folder to sync to hybrid) before the live migration of all the PF's.

I can only see a workaround to sync all the public folders - https://learn.microsoft.com/en-us/exchange/collaboration/public-folders/configure-legacy-public-folders-for-hybrid?view=exchserver-2019. Thanks ahead!

Answer 1

Hi @Ian Justine Baluya ,
According to the supported and recommended solutions provided by the official Microsoft article, there is currently no option to migrate specific legacy public folders to Exchange Online. Considering the complexity of migrating legacy public folders to Exchange Online, the verification of the public folders of the source server and the creation of the mapping file are all done by a specified script provide by Microsoft. The following article details how to use batch migration to migrate legacy public folders to Exchange online, this is the only supported public folder migration method.
Please refer to: Use batch migration to migrate legacy public folders to Microsoft 365 or Office 365 and Exchange Online

If you use the above solution, there are still points that need to be paid attention to before the migration. Such as:

1. The version of on-premises Exchange server must be Exchange 2010 SP3 RU8 or later.
2. In Exchange online, you are limited to 1,000 public folder mailboxes, and the maximum total size of all public folder mailboxes is 100 TB. Hierarchy Serving mailboxes are limited to 100 public folder mailboxes.
3. Before start the migration batch, split the public folder into multiple public folders that are each 2 GB or less.
   And so on, more information you could refer to the article provided above.

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