A regular user of Microsoft exchange server stores lots of emails in the mailbox. It is an application where we can store large number of e-mails. There is a mailbox present inside the exchange server where all the emails are stored. These e-mails are stored with the .ost extension name. Ost stands for offline storage folder. Just like .pst of Microsoft outlook the .ost is also used to store emails, contacts, notes and other files. But sometimes due to our mistakes we face various situations. Sometime when we regularly accessing the mailbox the emails stored inside the mailbox become corrupted and we are unable to access the file.

Various reasons are responsible for the inaccessibility of the ost files some of them are mentioned below:

1. Virus attacks
2. The ost file is corrupted or damaged
3. Hardware problem
4. The exchange server system is unexpectedly shutdown
5. Software malfunctioning
6. Corruption in database
7. Server failure

These reasons are mainly responsible for the inaccessibility of the ost files. Apart from these six reasons the OST file will also get corrupted when he exceeds his limit beyond 2GB. When this file exceeds file size limitation then chances to loose data become high. While trying to open the file whose size is more than 2GB you may encounter various error messages. Some of them are:

1. Microsoft exchange server reported error-0x00040820
2. Errors in background synchronization
3. Messaging interface has caused an unknown error
4. Errors have been detected in the file outlook.pst

These error messages remind you that your ost data become corrupted and need exchange ost recovery option. Users are always trying to get rid from this type of situation, so he created a backup in order to restore their ost files. But in the absence of backup problem will arise for you. You are going to loose all your ost files very soon. If you are unable to handle this type of situation, then you have to try 3rd party exchange ost recovery software that allow you to recover your ost files of Microsoft exchange in order to get back the required emails.

Some of the key features of the exchange ost recovery software are:

1. This application recovers the files in simple way.
2. It is compatible with all versions of windows 2000, 2003, XP, VISTA
3. Restore all your ost files like notes, contacts, emails etc.
4. There is a preview option of your recovered ost files
5. It is compatible with ms outlook 2000, 2002, 2003 and 2007

Download exchange ost recovery software if your ost files become corrupted and you are unable to access this file so that in future you will never face this situation again.