When you plan antivirus scanning for Microsoft Outlook Date files and email messages, you should be aware of potential issues that can arise if certain Outlook files are in use during scanning.

Scanning Outlook files

Outlook Data Files (*.pst) and Offline Folder files (*.ost) are the most frequently-accessed Outlook files. If antivirus perform file-level scanning on them while Outlook is in use, data corruption issues might result.


We recommend that you turn off scanning of Microsoft Outlook Data files:


Go to Filter Management tab from the cloud console. 

Click on Edit to modify the policy

Then go to Endpoint à Antivirus

Expand the Detection Settings

Remove the check box next to Detect inside e-mail database





  • We are not aware of a risk of excluding Microsoft Outlook Data files from antivirus scans. However, your system may be safer if you do not exclude any files or folders from scans. 
  • You may consult with Microsoft about removing infections from the Outlook Data files.

Once finish making changes, click on Save button to make the changes permanent.

Scanning email messages

We do not recommend that you scan *.pst, *.ost, and other Outlook files directly. Instead, we recommend that you scan email message attachments on the email server and on the Outlook client computer. You may use iSheriff email security which includes antivirus software that was developed to scan incoming and outgoing email messages.

Related Article(s):

How to manually reload the policy on an endpoint? 

How do I exclude certain files or folders from real-time scanning?

Recommended Anti Virus Exclusions list