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People use several categories files in different format, depends the necessary condition. How to convert OST files to PST files?
The .ost is a Microsoft exchange email file. It needs to be converted to .pst to read it in offline. This conversion is easy reachable in office 2000 with some limitation to work in office 2003. To overcome this problem you can use several converter utility like OST 2 PST Converter,Unistal OSTto PSTConverter 1, Stellar Phoenix Convert OST to PST, and so on. The OST 2 PST Converter software converts the .ost file to .pst file smoothly.
You can download the software form
Another choice for this job is Unistal OSTto PSTConverter.
This free utility is available in http://convert-ost-file-to-pst-file.winsite.com/