When your public folder content migration to Exchange Online is complete or you create public folders for the very first time, you do not have to worry about managing many aspects of public folders. ...
Updated Jan 11, 2021
Version 2.0
Blog Post
8 MIN READ
How Exchange Online automatically cares for your public folder mailboxes (via AutoSplit)
After migrating a big infrastructure (320k public folder with about 25TB, legacy with native scripts and not third party) three weeks ago, I encounter another issue with the autosplitting. The mailbox never goes into sync state and therefore always fails to autosplit.
ReducedStateProgressState: PrepareSplitPlanCompleted
ReducedStateAutoSplitRetryCounters: MRF:1;MRTTLTC:0;MRIB:0;MRNI:0;MRFF:0;SRF:0;CNM:False;SSBM:False;XRFS:False;XRFT:False;Error: Folder hierarchy is in inconsistent state at source mailbox. Please run Update-PublicFolderMailbox cmdlet on source to fix this problem.
Running the update-publicfoldermailbox is not changing it.
Microsoft has now increased the quota for this Mailbox to 135GB and closed the ticket. The Mailbox is still growing and the splitting is not working. What would be the next steps for debugging here?