Administrators managing public folders in Exchange Online may encounter scenarios where data loss occurs due to various reasons. For example, a user might delete an email from a public folder and lat...
Published Jan 23, 2026
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Thanks for sharing this detailed information on modern public folders in Exchange Online.
Does the automatic PF mailbox provisioning process ensure that a new PF mailbox contains at least 10 MB of data to ensure proper functionality of retention policies?
Hazem_Embaby
Microsoft
MicrosoftIf I understand your question correctly you mean AutoSplit process if yes then this is not defined on that process cause the purpose of AutoSplit is to move Public folders from source PF mailbox to newly provisioned PF mailbox to load balance PF mailbox size and the trigger of that movement is when source PF mailbox exceeds size ProhibitSendQuota which is between 40 - 80 GB depending on mailbox type "Primary/Secondary", so 10MB size is not going to be an obstacle here as the mailbox shall be filled with actual huge moved data, I hope that answered your question.