The difference in file sizes can be explained by the different storage, archiving, and processing methods that are used by Microsoft Exchange Server and Microsoft Outlook when working with OST files.
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Steps for obtaining a PST file from an OST file:
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All you need to do is upload your OST file to the service in the same way that you would upload files to a cloud storage service (such as iCloud, Dropbox, Google Drive, OneDrive, etc.) and wait for the service to automatically convert all the files and provide you with a converted PST file to download. You do not have to have Microsoft Outlook, Exchange Server or Windows Domain Controller installed on your device. This online service allows you to perform an OST2PST conversion using any device (Windows, Android, iOS and other).
#Online ost to pst converter free how to#
How to convert an OST file to PST file online