How To Open Ost File

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Microsoft Outlook 2010 doesn’t support manually opening or importing items from an offline Outlook Data File (.ost).

Note: By default, when you add an account that uses an offline Outlook Data File (.ost), the file is automatically created and data from the server is downloaded. Also, if you specify a new folder location for the offline Outlook Data File (.ost), a new file is automatically created. Although not required, you can manually move the existing file to the new folder to avoid the download time that is required to re-create the file. For more information, see Move an Outlook data file.

However, if you can access the contents of the OST file in your Outlook, then you can perform the conversion manually, as follows: 1. Start Outlook. Make sure you can access all the contents in the OST file to be converted. Create a new PST file. Go to the OST file, select and copy all the contents to be converted with your mouse. Just a few steps are needed to open an OST file. Open OST PST Viewer and go to the file menu, choose “open” and find the OST file you want to open. After that, you can view OST files. Open multiple OST files, search and copy or export any data from old OST files.

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Outlook Data Files (.ost) are used when you have an Exchange account and want to work offline or use or use the default Cached Exchange Mode. This type of data file is also used for accounts that you set up with the Outlook Connector for Outlook.com (formerly Hotmail). Outlook Data Files (.ost) are always copies of items that are saved on a mail server and don’t need to be backed up like Outlook Data Files (.pst).

Re-create an offline Outlook Data File (.ost)

Offline Outlook Data Files (.ost) are copies of your Exchange information. It is not necessary to back up this file. You can create a new copy at any time.

  1. Exit Outlook.

  2. In Control Panel, click or double-click Mail.

    Where is Mail in Control Panel?

    Mail appears in different Control Panel locations depending upon the version of the Microsoft Windows operating system, Control Panel view selected, and whether a 32- or 64-bit operating system or version of Outlook 2010 is installed.

    The easiest way to locate Mail is to open Control Panel in Windows, and then in the Search box at the top of window, type Mail. In Control Panel for Windows XP, type Mail in the Address box.

    Note: The Mail icon appears after Outlook starts for the first time.

    The title bar of the Mail Setup dialog box contains the name of the current profile. To select a different existing profile, click Show Profiles, select the profile name, and then click Properties.

  3. On the E-mail tab, select the Exchange account, and then click Change.

  4. Clear the Use Cached Exchange Mode check box.

  5. Click More Settings.

  6. On the Advanced tab, click Offline Folder File Settings.

  7. Click Disable Offline Use, and then in the dialog box that appears, click Yes.

    Note: If you cannot click Disable Offline Use, this indicates the Use Cached Exchange Mode check box was not cleared in step 4. This check box must be cleared.

  8. Again, click Offline Folder File Settings.

  9. Click OK.

  10. In the dialog box that appears, click Yes.

  11. Under Cached Exchange Mode Settings, select the Use Cached Exchange Mode check box.

  12. Click OK, click Next, and then click Finish.

  13. In the Account Settings and Mail Setup dialog boxes, click Close.

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If you’re unable to open Microsoft Outlook, you’re going to have a rough time of keeping up with your email and calendar. File corruption, changes to the system by other applications, or simple human error can cause you to lose your OST file; without the OST file, Outlook will be unable to communicate with your Exchange server. You can replace the OST file at any time to restore Outlook functionality.

What Is the OST File?

Microsoft Outlook normally relies on your Exchange server to show and update your email messages, calendar and other data. However, it’s possible to tell Outlook to back this data up to an offline file, just in case you need access to this information when away from Exchange. The OST file stores a copy of your Outlook folders and automatically syncs with the Exchange service whenever you regain access. It is not necessary to enable offline Outlook use, but Outlook may have trouble running without the OST file.

Access Your Mail Settings

Fixing the missing OST file isn’t done through Outlook, but through the Windows Control Panel. Close Outlook and open the Control Panel by swiping to the bottom right corner of the screen, clicking “Settings” and choosing “Control Panel.” Open the “Mail” option, click the “E-Mail Accounts” tab and choose your Exchange account. Click the “Change” button to gain access to the options available for that account. If you do not have administrator access to your PC, you may not be able to open this menu or modify its settings.

Disable Offline Use

Once inside the “Change” menu, you’ll be able to modify Outlook’s offline settings. Clear the check box next to “Use Cached Exchange Mode.” Next, click the “More Settings” button and select the “Advanced” tab. Choose “Offline Folder File Settings.” Click “Disable Offline Use” and then confirm your choice on the dialog box that appears. This will clear the old OST file and prepare your system for a new one.

Recreate the OST File

Click “Offline File Folder Settings” again. Click “OK” when prompted and confirm your choice by clicking “Yes” in the box that appears. Re-check the box next to “Use Cached Exchange Mode,” click “OK,” select “Next” and click the “Finish” button. Close the “Account Settings” and “Mail Setup” boxes when you’re finished. Outlook will have created a new OST file that can be recognized the next time you open the application.

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Bowerman, Todd. 'The OST File in My Windows Outlook Is Missing.' Small Business - Chron.com, http://smallbusiness.chron.com/ost-file-windows-outlook-missing-79216.html. Accessed 30 May 2019.
Bowerman, Todd. (n.d.). The OST File in My Windows Outlook Is Missing. Small Business - Chron.com. Retrieved from http://smallbusiness.chron.com/ost-file-windows-outlook-missing-79216.html
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