Method 2: Disable and re-Enable Cached Exchange Mode. If Outlook still does not open because the "username.ost" file is not accessible, continue to next method. When done, start Outlook again and check if the problem is fixed. In the Processes tab, right-click at the following processes (if running), and select End Task.ģ. Press CTRL + SHIFT + ESC to open Task Manager.Ģ. Some processes and services running in the background may cause Outlook to fail to open with the error "The Outlook username.ost file is in use and cannot be accessed". Method 1: Kill all Outlook Related Processes. Force Outlook to re-create the Outlook OST file.These simple steps often fix the error "Outlook username.ost file is in use and cannot be accessed". * Suggestion: Before you try any of the following methods, the first thing to do is to save all your current work, then close all running programs and restart your computer. OST file is in use and cannot be accessed in Outlook 2019, 2016 or Outlook for Office 365. You might need to restart your computer.Īs a result of this error, Outlook does not start and users cannot access their emails because the OST file is being used or has been corrupted. Close any application that is using this file, and then try again. The file C:\Users\*****\AppData\Local\Microsoft\Outlook\username.ost is in use and cannot be accessed. after a power outage), then the following error message may appear when launching Outlook: during synchronization of Outlook with Exchange Server, Outlook crashes because of a poor network connection, or a sudden computer shutdown (e.g. * Note: Where "username" is your Exchange account name.
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* When Outlook is configured in this way, users can see all their emails even when working in offline mode and once they are back online, all their emails will be synchronized with the Exchange server again. If you have enabled the "Use Cached Exchange Mode" option in Outlook account settings, Outlook download and stores locally all your email messages that are on the Exchange Server in a file named "username.ost". If you cannot open Outlook because the "username.ost" file cannot be accessed because it is in use or corrupted, continue reading below to fix the problem.
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