-As communicated in MC256835 (May ’21), starting August 16th 2021 the service will start retaining 30 days worth of versions for any PST files stored in 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 only impacts previous versions of PST files stored in your document library storage. As best practice, PST files should not be uploaded on OneDrive for Business and SharePoint Online team site document libraries due to the impact on storage and network bandwidth.
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