Convert Old OST to PST - Version 3.7 Convert Old OST to PST Software can convert data for MS Exchange OST files to PST files. Convert Old OST to Outlook Supports Microsoft Exchange server 2010, 2007, 2003, 5.5 and 5.0. You can use our OST to PST Converter Software by using simple steps to convert your OST file into PST. This Software approved by professionally use OST to PST Converter Software for Convert Old OST file to Outlook in just few steps use. OST to PST Software compatible in these Operating Systems Window7, Vista, Server 2003, XP, and 2000. You can doubt free download our Convert Old OST to PST Tool free of cost on our website. If you fully satisfied with our Convert Old OST to PST Software, than purchase it in very small price only on $99 for personal license, and $199 for business license with 24x7 free technical supports for software.