Yes, there are a few free ways to convert an OST to a PST file, but they come with certain limitations. One manual method is using Microsoft Outlook if you have access to the original Exchange account. You can open the OST file in Outlook and export the data to a PST file. Another option is to use the "Import/Export" feature in Outlook to move mailbox items to a new PST file. However, if the OST file is orphaned or inaccessible, you may need an OST to PST Converter tool, as manual methods may not work in such cases. Some free OST to PST Converter tools are available, but they often have restrictions, such as limited file size conversion.

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