Fixed: Outlook Web App Can’t Download Attachments in Windows 10

If you’re a regular Microsoft Outlook user, you’re probably familiar with the downloadable client and the Web App. Both programs have essentially the same functionality, although some prefer the Web App so as not to clutter your computer’s hard drive.

However, some users have reported problems downloading attachments when using the web version, especially in Google Chrome.

Causes of Outlook web app not downloading attachments

Low bandwidth: If you are accessing Outlook Web App over a network connection with low bandwidth, this may be the cause of the current error.

Browser compatibility: If you try to download attachments using a browser that is not supported by Outlook Web App, you may encounter the following error.

ISP network restrictions: ISPs have methods to keep everything under control and limit certain network resources, and these ISP-imposed restrictions may be the root of the current problem.

Cache/cache/user data mismatch: Old cookies/caches/user data may be affecting Outlook Web App functionality and causing the current error.

Restriction by security programs: Security programs, such as anti-virus programs and firewalls, typically restrict network resources that they consider malicious, and if these programs have identified Outlook Web App as malicious due to an error, the restrictions created by these programs may cause the current Outlook Web App error.

Suspicious Sender: Outlook Web App uses sender filtering to weed out rogue and malicious senders, and if your sender is considered suspicious by Outlook Web App, this can cause the error we are currently experiencing.

Blocked Attachment Extension: Outlook Web App by default blocks certain types of file extensions as attachments, and if you try to download such a file as an attachment, Outlook Web App will not allow the download.

New UI: Microsoft often releases a new UI to add more features and improve the usability of the Outlook Web App, but sometimes the new UI may cause the current problem due to a coding error.

Incompatible Brower`s add-ons: Some add-ons are incompatible with Outlook Web App, especially AdBlock, which is known to interfere with Outlook Web App functionality, causing the current error.

How to solve the problem when Outlook Web App can’t download attachments?

Turn off the secure web browsing feature

  1. Start Chrome and type chrome://settings/ in the link bar, then click on the Sync and Google services option.
  2. Click Reset Settings to Original Defaults.
  3. Finally, click Reset Settings.
  4. It will take some time to complete the process; after that, the browser will automatically restart.
  5. Now use Outlook online and check again.

Disabling the add-ons

  1. Start Chrome. Click on the 3 dots in the top right corner. Go to Advanced Tools -> Advanced.
  2. Select add-ons/extensions individually and click Remove to remove them.
  3. Click Delete again to confirm.
  4. Now go to Outlook on the Web and download the attachments.

Running the light version of Outlook on the Web

There is a light version for Outlook on the Web that allows the application to work in low bandwidth, limited availability and with older web browsers. Users can upgrade to this lite version and then try to download attachments from there.

  1. Log in to your Outlook on the Web account.
  2. Navigate to the Settings option in the upper right corner. Click on Mail.
  3. Click the General option, go to Display Options, click Outlook Web App Version, and then select the Use Outlook Web App Light version check box.
  4. Exit the current account, and then log back in.
  5. This time, use the light version of the Outlook Web App.
  6. Now go to the email with the attachments and try to download the attachments.

Launch Outlook on the Web with a different Web browser

Some web browsers may not be compatible with Outlook on the Web and thus prevent some of its functions. Therefore, try running Outlook online using a different web browser.

For example, if you use Google Chrome, switch to a different browser such as Microsoft Edge or Internet Explorer. It is possible that when you switch web browsers, the problem will be solved and you will be able to download attachments from your incoming emails.

Frequently Asked Questions

Outlook Web App usually stops downloading attachments due to browser compatibility issues, low bandwidth, cache/cookie/user data conflicts, security software limitations, ISP network restrictions, unsupported attachment extensions, and other web browser issues.

  1. After opening a message, click on the file name of the attachment you want to open.
  2. In some browsers, the Download File Name dialog box appears.
  3. Click OK to perform the selected action, or Cancel to return to the message body.

  1. Use a file share to access the attachment.
  2. Use a file compression utility to change the file name extension.
  3. Rename the file to a different extension.
  4. Ask your Exchange server administrator to change the security settings.

If you're using Microsoft Outlook and can't open an attachment, you may need to turn off add-ons. In Microsoft Outlook, click File -> Options -> Add-ins. Under Manage, click COM Add-ins, then GO. Close Microsoft Outlook, open it again and upload the attachment again.

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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog,, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.