Data of the OST file gets synchronized with the data of the PST file, when you connect with the Exchange server. OST files allow you to access mail-objects, such as contacts, attachments, appointments, tasks, journals, events, and more, even without Internet connectivity. But you will be shocked to hear that when offline storage file gets corrupt, data of MS-Outlook cannot be accessed. So to solve the above issue, you will need to repair the offline storage file. Scanost.exe is an inbuilt utility that is used to check the integrity of the OST file, and repair the file. But it fails many times! So make use of an OST to PST converter to convert OST to PST.

Let's illustrate an error message that is seen when you use Microsoft Outlook and suddenly gives you an error message that looks like as given below:

"The file OST_File_Pathoutlook.ost is already in use by the maximum number of applications. Close some of the applications, and then try again."

While using Outlook, the above error message gets received many times.

Cause: There can be main two causes for the occurrence of the above error message and these are as follows:

• As stated in the error message, it is suggested that line storage file of Outlook is accessed by several applications. This might be the reason for the above error.
• Otherwise Outlook OST file is corrupt or damaged.

Solution: Listed below are the measures for the above error message:

• Close all the applications. Restart the computer to solve the above issue.
• If the above method doesn't work, then execute the Scanost.exe tool. This will scan the OST file, and repair the corruption. For executing the tool, follow the below mentioned steps:
1. Close MS-Outlook application.
2. Go to Start >> Run. In the box that appears, enter the following path: drive:Program FilesCommon FilesSystemMapiLocaleIDscanost.exe, where LocaleID is the local identifier
3. Select OK and select 'Scan all folders'.
4. Select 'Repair errors' checkbox and select an option 'Begin scan'. 
•  If Scanost.exe integrity tool fails to resolve the issue, then opt for a third-party OST to PST converter

 These tools convert OST to PST and extracts data from the Outlook OST file. For using these tools, it is not necessary for you to have a strong technical skills. These software are developed specifically to perform this task, and feature a simple interface and read-only nature.

OST to PST Converter is a proficient tool used to convert OST to PST. Unusable OST files become usable. It repairs the file without affecting the main structure. The tool recovers mail-objects, such as attachments, appointments, contacts, journals, tasks, events, and similar features. The tool is compatible with Windows 7, Vista, XP, Server 2003, and 2000.

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