"Failed to open message store" Error

Last reviewed on May 23, 2013

Some users report receiving this error:

Failed to open message store.

Microsoft Office Outlook Offline Folders [269287937] : The file C:\Documents and Settings\username\Local Settings\Application Data\Microsoft\Outlook\outlook.ost is in use and could not be accessed. Close any application that is using this file, and then try again. (Error: 0)

This error affects Outlook users who link to a SharePoint calendar to Outlook. If you remove the calendar from your profile, you will eliminate the error.

Go to Account Settings, Sharepoint Lists tab and select the SharePoint calendar then click Remove to delete the subscribed calendar from your profile.

Delete Sharepoint list from Account Settings

Written by

Diane Poremsky
A Microsoft Outlook Most Valuable Professional (MVP) since 1999, Diane is the author of several books, including Outlook 2013 Absolute Beginners Book. She also created video training CDs and online training classes for Microsoft Outlook. You can find her helping people online in Outlook Forums as well as in the Microsoft Answers and TechNet forums.

Please post long or more complicated questions at Outlookforums.

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