Email Sync Problems

How to Disconnect Outlook Email Storage from OneDrive

Elise Williams Sep 30, 2026 869 views

Question details

The user wants to prevent Outlook data files from synchronizing with OneDrive to avoid using up cloud storage capacity.

How to Disconnect Outlook Email Storage from OneDrive

Product: Microsoft Outlook and OneDrive
Device & OS: not provided
Scenario: Managing cloud storage and preventing unwanted synchronization of local email data files.
Observed behavior: Outlook data files are automatically syncing to OneDrive, consuming unnecessary cloud storage space and potentially causing sync errors.

Before you start

Ensure Microsoft Outlook is completely closed before making changes to your data files or OneDrive sync settings to prevent file corruption.

Solution 1Recommended

Exclude Outlook Files from OneDrive Sync

Stop OneDrive from syncing the specific folder where your Outlook data files (.pst or .ost) are stored.

By default, OneDrive may back up your Documents folder, which often contains your Outlook data files. Excluding this specific folder stops the continuous syncing loop.

Open OneDrive Settings

Right-click the OneDrive cloud icon located in your Windows taskbar notification area, click the gear icon, and select 'Settings'.

Choose Folders to Sync

Navigate to the 'Account' tab and click on the 'Choose folders' button.

Uncheck the Outlook Folder

Locate the folder containing your Outlook data files (typically 'Documents' > 'Outlook Files'). Uncheck this folder to exclude it from synchronization, then click 'OK'.

Exclude Outlook Files from OneDrive Sync

Sync Disabled: Once excluded, your Outlook data files will remain locally on your computer without consuming your OneDrive cloud storage capacity.

Solution 2

Move the Outlook Data File to a Non-Synced Local Folder

Physically relocate your Outlook data file to a directory that OneDrive does not monitor.

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Frequently Asked Questions

Why shouldn't I store Outlook data files on OneDrive?

Outlook data files (.pst and .ost) are constantly being updated while Outlook is running. Syncing them via OneDrive can lead to high network bandwidth usage, file locking conflicts, and potential data corruption.

Where are Outlook data files stored by default?

By default, Outlook .pst files are usually stored in C:\Users\[YourUsername]\Documents\Outlook Files. Because OneDrive often backs up the Documents folder automatically, the Outlook files get synced to the cloud.

Will un-syncing my Outlook data file delete my emails?

No, excluding the file from OneDrive sync only stops it from being uploaded to the cloud. Your emails and account data remain safely stored on your local hard drive.

How do I free up OneDrive space after stopping the sync?

Once you have moved or excluded the local file, you can log into OneDrive via your web browser and delete the previously synced Outlook data file from the cloud to instantly free up storage space.

Outlook & Email Problems