MC256835 – (Updated) Adjusting Version Retention for Outlook Data Files (PST File Type)

OneDrive for Business logo

check before: 2021-08-13


OneDrive, Outlook, SharePoint


Online, World tenant


Change type:

Admin impact, Updated message, User impact



Updated May 18, 2021: We have updated the post to provide additional clarity. Thank you for your feedback. The PST version retention policy changes are being introduced to address concerns around storage impact of PST versions and will ensure PST file versions no longer consume storage for extended periods. When PST files are uploaded on OneDrive for Business and SharePoint Online team site document libraries, Outlook constantly updates PST files generating multiple versions which leads to storage being quickly consumed by the multiple versions of the PST file. With these changes the service will always retain a minimum of 30 day worth of PST versions that can be restored from.Note: These changes will have no impact on the actual PST file itself which will continue to be available.Starting June 28th admins can download the latest version of the SharePoint Management Shell and start opting out using SharePoint Online Management Shell cmdlet provided below. You will have until August 16th to opt out.Command: Get-SPOTenant/Set-SPOTenant Parameter: DisableOutlookPSTVersionTrimming Value: True - Opt-out to the versioning change. False - default valueNote: We do not recommend uploading PST files due to the impact they have on network bandwidth and storage:To prevent uploading .PST files from the OneDrive sync app, read '' target=blank>Block syncing of specific file types . To move .PST files out of OneDrive, read '' target=blank>How to remove an Outlook .pst data file from OneDrive .Starting August 16 2021, we'll be introducing new retention policies for Outlook Data Files (PST File type) Versions to prevent them from consuming storage capacity for OneDrive SharePoint Online. The new policy will limit the number of PST versions retained, resulting in greater storage capacity from PST version storage. With this new retention policy, PST file versions will be retained for up to 30 days.

Change Category:





task type:
Plan For Change

the free basic plan is required to see all details. Sign up here

A plan is required to see all the changed details. If you are already a customer, choose login.
If you are new to please choose a plan.

Login to your account

Welcome Back, We Missed You!