June 2017 Security Update Breaks Outlook Search

The June 2017 security update for Windows causes problems for search in Outlook clients using cached mode.  Uses will see incomplete search results and may be notified that:

Search results may be incomplete because items are still being indexed.

This issue affects Windows 7, Windows 8.1, and Windows 10. It also affects all versions of Outlook.


Microsoft has fixed this issue with a new update released on June 27th. You can download the update here:

• Windows 10 - KB 4022716
• Windows 8.1 - KB 4022720
• Windows 7 - KB 4022168

These fixes are for retail, OEM, and volume licensed versions of Outlook. If your Outlook is included with an Office 365 version of Microsoft Office, then updates are already available and should be installed automatically. If they are not installed automatically performed the following steps:

1.  In Outlook, click the File tab, and click Office Account.
2. Click Update Options and click Update Now.

To review Microsoft's documentation on this issue, see Issue #5 on this page:

•  Outlook known issues in the June 2017 security updates