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How to Fix SharePoint Size Limits and Outlook Desktop Issues

Maira Mehtab Sep 28, 2026 868 views

Question details

The user is experiencing storage or sync issues in Outlook Desktop related to SharePoint size limits, affecting specific accounts without providing explicit error messages.

Product: Microsoft Outlook and SharePoint
Device & OS: not provided
Scenario: Attempting to sync, access, or manage SharePoint data through the Outlook desktop application.
Observed behavior: Outlook Desktop encounters functional issues or fails to sync properly due to underlying SharePoint storage constraints or size limit conflicts.

Before you start

Before troubleshooting, carefully note down any exact error codes or warning messages displayed in Outlook or SharePoint, and check your total available SharePoint storage space via the Microsoft 365 Admin Center.

Solution 1Recommended

Identify the Exact Error Message and Check Storage

Since the issue is unclear, the most critical step is pinpointing the specific error code or identifying if you have exceeded your SharePoint site storage limit.

Troubleshooting sync and size limit issues requires knowing exactly which constraint is being hit. This could be an Outlook local storage (OST) limit or a SharePoint tenant storage limit.

Reproduce the issue

Open Outlook Desktop and perform the exact operation (like syncing a folder or opening a file) that triggers the malfunction.

Record the error details

Note down any specific error codes, warning banners, or pop-ups that appear in Outlook. Take a screenshot, ensuring you blur out any personal or sensitive information.

Check SharePoint capacity

Log in to the Microsoft 365 Admin Center as an administrator, navigate to 'Active sites', and check if the affected SharePoint site has reached its maximum storage limit.

Verify Outlook version

Click on 'File' > 'Office Account' in Outlook to confirm your exact application version, which can help IT support narrow down compatibility bugs.

Gathering details for support: Providing your IT administrator or Microsoft Support with the exact error message, affected users, and screenshots dramatically speeds up the resolution process.

Solution 2

Reduce the Outlook Offline Sync Window

If large SharePoint libraries are causing Outlook to freeze or hit size limits, reducing the local sync window can free up space in your OST file.

Free Microsoft Office alternative

Switch to WPS Office for Seamless Document Management

If you frequently encounter complex syncing errors, confusing size limits, or heavy application performance issues with Microsoft Office and SharePoint, consider trying WPS Office. It provides a lightweight, highly compatible alternative for creating, editing, and managing your documents without the heavy overhead of legacy desktop clients.

1. Download the installer: Visit the official WPS website and download the free installation package for your operating system.
2. Install WPS Office: Run the downloaded executable file and follow the simple on-screen instructions to install the suite.
3. Open your files: Launch WPS Office and directly open your existing Microsoft Office documents, spreadsheets, and presentations with perfect formatting retention.

Fully compatible with Microsoft Word, Excel, and PowerPoint file formats (.docx, .xlsx, .pptx).Lightweight installation with extremely fast startup times that won't freeze your system.Built-in cloud storage options that bypass complex SharePoint sync limitations.Familiar, intuitive user interface requiring zero learning curve for traditional Office users.

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Frequently Asked Questions

What is the maximum file size limit for uploading to SharePoint?

By default, the maximum file upload size for SharePoint Online is 250 GB per file. However, overall site storage limits depend heavily on your organization's specific Microsoft 365 subscription plan and allocations.

Why does Outlook freeze when syncing large SharePoint folders?

Outlook may freeze or crash if the synchronized SharePoint data exceeds the local OST file size limit, which is typically configured to a maximum of 50 GB. Reducing the offline sync window can help prevent this issue.

How do I find out which exact version of Outlook I am using?

To check your version, open the Outlook desktop app, click on 'File' in the top left corner, select 'Office Account' (or 'Help'), and review the details listed under the 'Product Information' section.

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