OST is an Offline folder file used in Microsoft Outlook email service. It allows users to work on offline mode and later it synchronizes all the changes or modifications on the Exchange server. This feature of Outlook email is helpful for those organizations where Internet connectivity is unstable.
Related Topics about OST file
Outlook has two file formats one is OST and other is PST, OST permits users to work offline and store data on Exchange server whereas PST is the Personal storage table which stores all the mailbox data into user’s local device. However, Outlook by design doesn’t support manually opening or importing items from an offline Outlook Data File. On the other hand, the PST file can be opened easily.
PST is the personal storage table (.pst) used by Microsoft Outlook for handling POP3, IMAP and web-based mail accounts. Although, OST files are connected to the mail account configurations and cannot be opened independently.
A PST file is the standard file format used in Outlook and it is stored in user’s local machine and created while working with POP3, IMAP accounts.
OST file is the Xerox copy of Exchange server mailbox that is also stored on the user’s device and can be easily, deleted or edited.
For opening OST file without Outlook application, you need an OST Viewer tool. These are powerful tools which allows users to view their files even without having the email application. Follow below-given steps to view OST file with OST viewer tool:
Location of OST file may vary with Outlook as well as Operating system versions. Here below are the simple steps to find the location of OST file in different Outlook versions:
The OST is default storage file, which holds every piece of information that you save on Outlook. However, there may be a number of scenarios where users need to delete the OST file due to corruption or over-size issue. Deleting the OST file is easy task, only if you know the location of the file. Just find the folder and choose the OST file which you want to delete. But, if you don’t know the location follow below-given steps.
Note that location of OST file may vary on different Outlook versions
For proper functioning of Outlook you need healthy O.S.T file, so after successfully deleting the file, recreate it by following underneath steps:
Many times, users need to disable O.S.T file due to inevitable causes. If the OST file is no longer required, you should disable it. To disable O.S.T file follow below given steps:
The foremost step is to synchronize the O.S.T file from Offline folders to Server folders:
Once the synchronization process is completed, browse to Tools menu Email Accounts, View and tap Next
The file size of UNICODE OST is 20 GB in Outlook 2007. But in latest MS Outlook versions such as 2016, 2010, 2007, it has increased to 50 GB. Moreover, the technical limitation of the OST file is 4 PB (4096 TB). On the other hand, ANSI OST file comes with 2 GB of storage limit.
For taking back up from an OST file there are numerous manual approaches accessible, but it requires some technical knowledge to perform such processes. Moreover, these methods have some limitations which can hamper the data quality. Hence, it is suggested to use third-party OST to PST converter.