OneDrive File Issues

Fix OneDrive Reporting Excessive Storage Used by Outlook Archive

Maira Mehtab Sep 22, 2026 870 views

Question details

The user is experiencing a discrepancy where OneDrive reports an Outlook archive file is consuming 813 GB of cloud storage, whereas the local file size is only 28 GB.

Product: Microsoft OneDrive, Microsoft Outlook
Device & OS: not provided
Scenario: Checking cloud storage usage and managing Outlook archive (.pst) file synchronization.
Observed behavior: OneDrive incorrectly displays an excessively large storage footprint for a relatively small local Outlook archive file.

Before you start

Before modifying or deleting any files from your cloud storage, locate your local Outlook .pst archive file and create a secure backup copy on a separate local drive.

Solution 1Recommended

Manage Storage and Empty Recycle Bin via OneDrive Web

Checking your storage directly on the OneDrive web interface provides the most accurate data and allows you to clear out hidden file versions.

OneDrive often saves multiple version histories of large files that change frequently, like Outlook archives. These hidden versions and deleted items can accumulate in the cloud and inflate your used storage significantly, even if the local file remains small.

Access OneDrive Web Settings

Log into the OneDrive website using your Microsoft credentials. Click the gear icon in the upper right corner to open Settings, then select Options.

Open Storage Management

Navigate to Manage Storage or Storage Management to view a detailed breakdown of what files and versions are consuming your cloud space.

Empty the Recycle Bin

Check the OneDrive Recycle Bin from the left sidebar and empty it. Large deleted archive versions often remain there for up to 30 days before being permanently removed.

Contact Support

If the storage usage still displays incorrectly after clearing unnecessary files, visit the official Microsoft OneDrive support page to report the account discrepancy.

Note on Syncing Archives: It is generally not recommended to actively sync connected Outlook .pst files to OneDrive due to continuous file modifications and resulting version bloat.

Solution 2

Review Local OneDrive Sync Properties

Checking the local taskbar application can help identify if the issue is a simple caching or display error within the desktop client.

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Frequently Asked Questions

Why is my Outlook archive file taking up so much space on OneDrive?

OneDrive automatically keeps version history for modified files. Since Outlook archive files change frequently when connected to your email client, OneDrive may store multiple massive versions of the file over time, significantly inflating your reported storage usage.

How can I permanently delete files to free up OneDrive space?

Log into the OneDrive website, click on the Recycle bin in the left navigation pane, and select 'Empty recycle bin' at the top of the page. This permanently deletes the files and restores your available storage quota.

Should I keep my active Outlook .pst files in OneDrive?

No. Storing active Outlook Data Files (.pst) in OneDrive causes constant synchronization triggers, which leads to high network bandwidth usage, potential file corruption, and storage bloat due to excessive versioning.

What do I do if my OneDrive storage is still full after deleting files?

It can take up to 24 hours for OneDrive's storage quota to accurately update after a large file deletion. If the issue persists, check your 'Manage Storage' page for hidden app data or contact Microsoft Support for further account review.

Document & File Issues