If you are using a Microsoft Exchange Server account, every your email messages and other mailbox items like: calendar, contacts, tasks, notes, etc. are delivered to the server and saved on it. A local copy of these items can be stored on your computer system in an Outlook data file, which is known as OST (offline storage table). It is an offline Outlook data file that enables users to work offline or work with their mailbox data even when they are not connected to Exchange Server. Due to this feature, the file is called Offline Outlook data file. It gets automatically synchronized with the Exchange computer when the connection to MS Exchange Sever becomes available.
An offline Outlook data file is considered a beneficial file format for Outlook users; on the other hand, it has some negative points too. Like a PST file, it also has few limitations which may make some serious problems. As an Outlook PST file has a size-limitation, in the same way, an offline Outlook data file has also a size-limitation problem. If the file exceeds its size limit, it may become corrupted or damaged. This is not the only cause of corruption; in fact there are various reasons which may cause corruption, such as: virus attacks, hard drive failure, unexpected cancellation of MS Outlook, network failure, system power failure, synchronization error, etc.
If exceeding size of an OST file is the main issue, then it can be resolved by configuring a synchronization filter on your Exchange Sever mailbox folders. This manual technique helps you reduce the file size without causing any side-effect. The following steps are required to perform this technique:
Right-click the mailbox folder that you desire to reduce > click on Properties.
The Properties dialog crate appears. Click on Synchronization tab > Filter button.
The Filter dialog crate appears. Now choose the standard for synchronization (set the filters you desire).
Click on OK. Now restart your MS Outlook program.
If you are suspecting corruption in your offline Outlook data files, you may perform an integrity check by using SCANOST.EXE. This is very same to SCANPST.EXE and performs actions in the same way as SCANPST.EXE does. It is used to scan corrupt OST files and determine the errors in OST files. If the selected OST file is found corrupted, it automatically resets the file structure and rebuilds the headers.
SCANOST.EXE can be found in these locations according to your MS Office version:
For 2010: C:\Program Files\Microsoft Office\Office14
For 2007: C:\Program Files\Microsoft Office\Office12
For 2003: C:\Program Files\Common Files\System\MSMAPI\scanost.exe
For 2002/XP: C:\Program Files\Common Files\System\MAPI\scanost.exe
For 2000: C:\Program Files\Common Files\SystemMAPI\NT\scanost.exe
Before using this utility, make definite your MS Outlook program is not running on your system, it should be closed. Go to the location shown above according to your MS Outlook program and then follow the steps shown under:
Locate you SCANOST.EXE and double-click it.
The Microsoft Outlook Inbox Repair Tool window appears on your screen.
Now pick the profile that contains the corrupt OST file.
Select the appropriate option. Check the bin "Repair Errors" to resolve the issues.
Click upon Begin Scan to begin scanning selected OST file.
Once the file is scanned and repaired, you get a message saying OST repaired successfully.
Unluckily, SCANOST.EXE may fail sometimes to repair corrupt OST files. In such situation, you need third-party OST Recovery software that can repair your corrupt OST file and recover your data from it. As you have no other better option than this, you have to check it. It helps you scan corrupt OST files and fixes any level of corruption from them. Usually, third-party recovery tools are available with free demo or trial version. You can check them before buying the full version. Demo or trial version enables you to see the preview of recovered data and helps you examine the software.
SysInfoTools OST File Recovery software will help you repair corrupt OST files and recover unreadable data from them. It successfully restores email messages and other mailbox items from OST files and saves them to a new file. It offers six different file formats to save recovered data, such as: EML & DBX of Outlook Express, MSG & PST of Microsoft Outlook, MBOX and Archive (EML, VCF, ICF and Text) format. It works as an OST File converter tool as it supports multiple file formats for saving recovered data.
An offline Outlook data file is considered a beneficial file format for Outlook users; on the other hand, it has some negative points too. Like a PST file, it also has few limitations which may make some serious problems. As an Outlook PST file has a size-limitation, in the same way, an offline Outlook data file has also a size-limitation problem. If the file exceeds its size limit, it may become corrupted or damaged. This is not the only cause of corruption; in fact there are various reasons which may cause corruption, such as: virus attacks, hard drive failure, unexpected cancellation of MS Outlook, network failure, system power failure, synchronization error, etc.
If exceeding size of an OST file is the main issue, then it can be resolved by configuring a synchronization filter on your Exchange Sever mailbox folders. This manual technique helps you reduce the file size without causing any side-effect. The following steps are required to perform this technique:
Right-click the mailbox folder that you desire to reduce > click on Properties.
The Properties dialog crate appears. Click on Synchronization tab > Filter button.
The Filter dialog crate appears. Now choose the standard for synchronization (set the filters you desire).
Click on OK. Now restart your MS Outlook program.
If you are suspecting corruption in your offline Outlook data files, you may perform an integrity check by using SCANOST.EXE. This is very same to SCANPST.EXE and performs actions in the same way as SCANPST.EXE does. It is used to scan corrupt OST files and determine the errors in OST files. If the selected OST file is found corrupted, it automatically resets the file structure and rebuilds the headers.
SCANOST.EXE can be found in these locations according to your MS Office version:
For 2010: C:\Program Files\Microsoft Office\Office14
For 2007: C:\Program Files\Microsoft Office\Office12
For 2003: C:\Program Files\Common Files\System\MSMAPI\scanost.exe
For 2002/XP: C:\Program Files\Common Files\System\MAPI\scanost.exe
For 2000: C:\Program Files\Common Files\SystemMAPI\NT\scanost.exe
Before using this utility, make definite your MS Outlook program is not running on your system, it should be closed. Go to the location shown above according to your MS Outlook program and then follow the steps shown under:
Locate you SCANOST.EXE and double-click it.
The Microsoft Outlook Inbox Repair Tool window appears on your screen.
Now pick the profile that contains the corrupt OST file.
Select the appropriate option. Check the bin "Repair Errors" to resolve the issues.
Click upon Begin Scan to begin scanning selected OST file.
Once the file is scanned and repaired, you get a message saying OST repaired successfully.
Unluckily, SCANOST.EXE may fail sometimes to repair corrupt OST files. In such situation, you need third-party OST Recovery software that can repair your corrupt OST file and recover your data from it. As you have no other better option than this, you have to check it. It helps you scan corrupt OST files and fixes any level of corruption from them. Usually, third-party recovery tools are available with free demo or trial version. You can check them before buying the full version. Demo or trial version enables you to see the preview of recovered data and helps you examine the software.
SysInfoTools OST File Recovery software will help you repair corrupt OST files and recover unreadable data from them. It successfully restores email messages and other mailbox items from OST files and saves them to a new file. It offers six different file formats to save recovered data, such as: EML & DBX of Outlook Express, MSG & PST of Microsoft Outlook, MBOX and Archive (EML, VCF, ICF and Text) format. It works as an OST File converter tool as it supports multiple file formats for saving recovered data.
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