Software Developed by Outlook-PST.com
Inbox Repair Tool for Outlook v.1.0.2.0
Microsoft Outlook traditionally uses two types of storage files: PST for regular users and accounts and OST for offline storage of data synchronized with users' Exchange accounts.
Inbox Repair Tool for OST v.1.0.2.0
OST files are used by Microsoft Outlook as standard offline storage containers for Exchange Server accounts.