OST to PST tool is available for free download, which helps you analyze the software capabilities free of cost. Download and install the software to know how worthy it is for you. The free trial version has a limitation i.e. it only displays a preview of the items stored in OST file but does not allow saving those items in PST format.
Versions SupportedMicrosoft Exchange 2010, 2007, 2003, 2000, 5.5, and 5.
System Requirements for Installation Support
Operating System: Windows 95 with Internet explorer 4.0, Windows 98, Windows NT 4.0 with internet explorer 4.0, Windows 2000 up to Service Pack 4, Windows XP (Home, Professional) up to Service Pack 2, Windows 2003, Windows Vista, Windows 7.
Minimum Memory Requirement - 64 MB
Disk Space Requirement - 10 MB of Free Space