Did you know: As communicated in MC256835 (May ’21), starting August 16, 2021 the service will retain 30 days worth of versions for any PST files stored in Microsoft OneDrive for Business and SharePoint Online team site document libraries. This change will prevent cases of previous versions of PST files quickly consuming available storage. The change will only impact previous versions of PST files stored in your document library storage.
As best practice PST files should not be uploaded on Microsoft OneDrive for Business and SharePoint Online team site document libraries due to the impact on storage and network bandwidth. When PST files are uploaded on Microsoft OneDrive for Business and SharePoint Online team site document libraries, Microsoft Outlook updates PST files generating multiple versions which leads to storage being quickly consumed by the multiple versions of the PST file.
The SharePoint Online Management Shell cmdlet Set-SPOTenant – DisableOutlookPSTVersionTrimming $true can be used to opt out until August 13th 2021. This will have no effect after the deadline. Opt out only applies to existing document libraries and does not apply to new doclib created after August 13th 2021. New behavior will be automatically enabled if you don’t opt out by the deadline.
Value: True – Opt-out to the versioning change
False – default value
This feature is associated with Microsoft 365 Feature ID: 72237
How this will affect your organization:
As part of the change, version history for PST files will be retained for up to 30 days. Document libraries will be updated with new PST version retention limits. Once this change is rolled out to your tenant, versions of PST files stored on in your document library that are older than 30 days will be permanently deleted. With these changes the service will always retain a minimum of 30 day worth of PST versions that can be restored from.
What you need to do to prepare:
No action required – Document libraries will be updated with new PST version retention limits. If you wish to opt out of the PST version retention update, you will need to execute the SharePoint Online Management Shell cmdlet provided in this post by August 13th 2021.
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