Summary:  When the size of Outlook files increases then it became corrupted or can say MS Outlook fails to access the restored data in offline OST files when its size exceeds from normal size. So, after corruption how users can view their significant mailboxes data in any version of Microsoft Outlook from inaccessible, corrupted offline OST File? Let’s know about simple and easy way to repair damaged offline OST File and recover outlook data from corrupted, damaged offline OST file and view all emails and another important data in MS Outlook application.
Outlook OST File is used by MS Outlook to save all exchange account mailboxes data in cached mode to contact emails and anther data even in offline mode. Offline OST file is known as offline version of Exchange account and it allows users to work on their mailboxes when the internet connection is not connected or server downtime. The entire changes in offline mailboxes synchronized back to Microsoft Exchange server when the connection to Exchange Server enable or restored.
MS Outlook is one of the most well-organized emails software uses through many organization weathers small or big and persons and mostly they face issues while using Outlook due to many errors in offline OST file. OST file got corrupted due to many of reasons like- virus attacks, hardware or software failures oversized OST file. This corruption of OST file stops MS outlook application to access data and the users start several kinds of problems during using outlook software. In such case all users require to follow provided steps or points that will help to overcome from this corruption situation with outlook corruption and get back all important emails and mailboxes folders without losing any data with maintains all previous records.
Technique to view mailboxes from unapproachable OST file in Outlook
Primary solution to access data from corrupted OST file in outlook is migrating and converting offline OST file data into working PST Outlook format and import the created PST File in outlook to view all contacts, emails, calendars, task, notes etc. Here we will discuss about the three methods to convert the entire mailboxes of OST Files to PST file with recover all lost outlook mailboxes emails with attachments.
Method 1: Using Archive Method in Outlook
In this technique we usage Microsoft Outlook Archive Facility to Import mailbox data from offline OST file to a new PST file.
STEPS:
1.    Open Microsoft Outlook click on the offline OST file and select “Archive” option.
2.    Additional in the looked dialog box select the file or the folder that you need to archive.
3.    Browse and choice a folder to save the archived Outlook PST file.
4.    Now click on OK to twitch the archiving procedure.

Through using this manual technique, you can export entire your offline stored Exchange mailbox data to a vigorous PST file and then open this PST file in Outlook to access your data excluding your Outlook Contacts.
Method 2: Make use of Drag & Drop technique to export Mailbox folder
STEPS:
1.    Open MS Outlook Software
2.    Generate a new Outlook data file below Microsoft Outlook profile
3.    Drag & drop all mailboxes folders and emails to newly created Outlook PST file.
This technique is really very simple for using but it is lot of time-consuming and you can’t move all your contacts, inbox items, calendars, send items all together. You must drag and drop all folders separately from offline OST file to PST file manually. Hence, this procedure is time consuming and not much effective.
Method 3: Make use of third-party OST to PST Converter Software
If you want to convert offline OST files to PST Outlook file so you can make use of third-party OST to PST Converter software that is reliable and capable to repair damaged OST file and convert OST to PST File. VSPL Offline OST to PST Converter software easily fix all issues and convert OST file to PST included emails, contacts, journals, deleted items, task, notes etc. Software will support unlimited size of OST file for making conversion.
STEPS:
1.    Download VSPL OST to PST Converter and Install it on your PC.
2.    Run the software and add an Exchange OST file.
3.    Now you get preview all your mailbox items.
4.    Now in the convert option select PST file option as output file.
5.    Click on convert now to start the conversion procedure.
Now, after converting offline OST File to PST file using third method, save your PST file in any folder you want and open Microsoft outlook application. Now you need to create new MS Outlook profile where you have to import the converted PST files using export/ import wizard in MS Outlook software. After performing all the above steps, you can view your Microsoft Exchange data in outlook.
Conclusion:
As offline OST file is significant file to access and manage your Microsoft Exchange mailboxes and losing your valuable data due to errors in OST file very risky. But you can convert offline OST files to PST File using manual methods to recover your deleted or lost data. If manual methods fail to recover all lost data, then you can always try professional third-party tools to repair damaged OST file and convert OST files to PST files.