When Outlook is used in union with Exchange Server, the set up is likely to work with the Exchange mailbox offline. In the particular situation, Outlook will make an exact copy of your mailbox on the Exchange Server, called offlinefolders, and store it in a local file (ost), which is called offline folder file.ost file extension. Offline Storage Table or.ost file files are normally located in a predefined folder. You can search as .ost file from your local system to find out the location of the file. When you have any adverse conditions like the
Virus attack/Trojan effect
OST file is unable to harmonized with Exchange Server
Database type corruption
Accidental server shutdowns
All this condition in turn will affect the corruption of offline storage table and the only way to get data access back is to use s OST Recovery software to perform offline storage table recovery without alteration of the content of it.