technologywithin Knowledge Base

Outlook Error Message "Cannot Open .ost File"

This error message usually appears when Outlook is opening. .ost files enable Outlook to be used if the computer is offline. The files usually exist and this error suggests the file is probably corrupt.

The simplest thing is to try to force Outlook to rebuild it. Do this by navigating to C:\Users\USER\AppData\Local\Microsoft\Outlook and move or rename the .ost file. Open Outlook and it will rebuild the file when it can't find it.

For good measure, or if that doesn't work, go to C:\Program Files (x86) and search forĀ scanpst.exe. Run it to repair the files (try it on the .nst file as well).

There has been some experience of these measures not taking effect until after a reboot of the PC.

Attached Files
There are no attachments for this article.
Comments
There are no comments for this article. Be the first to post a comment.
Name
Email
Related Articles
Sharing and Syncing Outlook Contacts
Viewed 2326 times since Fri, Jun 30, 2017
Using Chromecast
Viewed 2468 times since Wed, May 24, 2017
Office Documents Will Not Open
Viewed 1742 times since Fri, Jun 30, 2017
Wi-Fi Router Emulator - TP-Link
Viewed 4262 times since Fri, Jul 14, 2017
Outlook Working Offline
Viewed 2066 times since Tue, Jun 13, 2017
Network Device Emulator - Trendnet
Viewed 1676 times since Fri, Jul 14, 2017
Wi-Fi Router Emulator - DrayTek
Viewed 1800 times since Fri, Jul 14, 2017
Wi-Fi Router Emulator - D-Link
Viewed 1808 times since Fri, Jul 14, 2017
Wi-Fi Router Emulator - Linksys
Viewed 1859 times since Fri, Jul 14, 2017
WAPs and Wireless Routers
Viewed 1808 times since Thu, Jul 20, 2017
MENU
test alex