MS Outlook along with Exchange Server provides an efficient email communication platform to its users. Exchange Server manages all sent/received emails and saves all user mailboxes in a single database named as EDB or Exchange Database. On the other hand, MS Outlook automatically creates OST (offline storage files) which are exact replica of Exchange server user mailbox. OST files are stored on the local user system and play very important role in uninterrupted email communication. OST file stores your email data when you are in offline mode because of no connection with Exchange Server. Further, all the changes done in OST file are synchronized with Exchange server database when connection is re-established between Exchange server and MS Outlook.
There are various hardware and software reasons that affect integrity of OST files. Some of them are hard disk failure, network connection failure, power failure, attack of malicious virus, abnormal termination of Outlook, synchronization errors etc. Such situations result in inaccessibility of OST file data. OST files cannot be directly accessed, you must need to convert OST file into PST format, which is easily accessible through MS Outlook. Thus, a proficient convert OST to PST tool can be helpful.
In case, the OST file is corrupt and you want to fetch email data, then you might come across various error messages that point towards damaged OST file:
"Event Type: Information
Event Source: Outlook
Event Category: None
Event ID: 30 Date: 5/10/2008
Time: 8:33:44 AM
Description: The store C:\Documents and Settings\user.domain\Local Settings\Application Data\Microsoft\Outlook\outlook.ost is being reconciled with the indexer for the following reason: Non-matching max change numbers."
Most of the times, this error occurs due to corrupt or damaged OST file.
If the OST file is damaged, then you can try an inbuilt tool named as OST Integrity Check tool (Scanpst.exe). For executing this tool, follow the steps below:
In spite of that, it you are unable to access your infected OST file then you should try Kernel for OST to PST, which is a sophisticated convert OST to PST and fixes all possible OST file issues. It enables you to access your emails, attachments, contacts, journals, calendars, and notes, drafts, sent items, etc. from inaccessible OST files by converting the OST file into PST format. It quickly extracts deleted, lost or unreachable OST file and converts them to Outlook PST format. It carries out an extensive scan of damaged OST file, recovers all email data, and displays them in a list with preview. Before purchasing it, you can try free trial version of this convert OST to PST tool.