What is a .OST File?
An OST file (.ost) is a Microsoft Outlook offline folder. These file types let Outlook users work offline and then when connected, synchronize the changes with the Microsoft Exchange server. Being able to work offline is useful in situations where internet connectivity is limited, unreliable, or not available.
If you need software to view an Outlook .pst or .ost file, try OST Viewer Pro. OST Viewer lets you print, search, export, view and convert email stored in Outlook .ost files. Download a 15 day free trial of OST Viewer Pro.
OST File Viewer Software
OST Viewer is the simple way to access the contents of a an .OST file. After installation, OST Viewer can be set as the default Windows software for .ost files.
OST Viewer will let you search, print, convert and export email messages that are locked in a .OST file. Access file attachments and message header informatmion.
Download a free OST File Viewer trial here.
