It is possible for OST files to become corrupt or inaccessible if the Outlook application terminates unexpectedly.If we are working with the OST file and there is a sudden power failure, the file may get corrupted.Use reliable antivirus software as sometimes Virus and malware attacks can also damage the OST files.OST files can become inaccessible if your hard drive contains bad sectors.So, we suggest you check the network connection properly. It is also possible to experience many OST errors due to the synchronization of OST files and Exchange servers.Below you will learn why Outlook cannot open OST files. So, it is appropriate to consider the most obvious reasons for the problem. Also, when we talk about Outlook data files, the number of causes is even greater. There can be various reasons for a single problem in Outlook. Viable Reasons of OST File Cannot be Opened Advanced Tool fix the OST file cannot be opened Problem.What to Do if the Problem Still Persists?.Disable the Cached Exchange Mode From MS Outlook Force Stop the Background Outlook Operations. How To Resolve ‘OST File Cannot Be Opened’ Error Manually?.Viable Reasons of OST File Cannot be Opened.Office 2013: Office 2013 Administrative Template files (ADMX/ADML) and Office Customization ToolĪdd the Outlk#.admx and Outlk#.adml files to your domain controller. Office 2016: Office 2016 Administrative Template files (ADMX/ADML) and Office Customization Tool To do this, follow these steps:ĭownload the Office Group Policy template appropriate for your version of Office from the following Microsoft website: If you prefer, you can use Group Policy to control whether Outlook uses the last known working AutoDiscover URL. In Mail, make sure that Always use this profile is selected, and then select your new profile name from the list. Type a name for the profile, and then select OK.įollow the Add Account wizard to add your email account. In Control Panel in Windows XP, type Mail in the Address box. To locate the Mail item, open Control Panel, and then in the Search box at the top of window, type Mail. HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\\Outlook\Autodiscover HKEY_CURRENT_USER\Software\Microsoft\Office\\Outlook\Autodiscover Method 1: Use ExcludeLastKnownGoodUrl to prevent Outlook from using the last known good AutoDiscover URLĬonfigure one of the following registry subkeys as follows: To resolve this issue, use one of the following methods. This issue occurs when the name of the pre-migration Autodiscover server is cached in your Outlook profile in the registry. ![]() Modify your profile to ensure that you are using the correct Microsoft Exchange information service. The Microsoft Exchange information service in your profile is missing required information. Verify you are connected to the network and are using the proper server and mailbox name. You receive the following error message when you open Outlook: You cannot use features such as Out of Office, meeting availability, mail tips, the online archive, or any other web services feature that relies on Autodiscover. ![]() Outlook cannot connect to Exchange Server. ![]() After your mailbox is migrated to Microsoft 365, you may experience the following issues:
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