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Mailbox data can be transferred from an OST file into PST format in several ways. Open Outlook and use the Import/Export Wizard to save your mailbox data as a PST file if you have access to your account. Depending on your requirements, you can select particular folders like Inbox, Sent Items, and Contacts.
The typical export technique might not be appropriate if the OST file cannot be accessed or if the original Outlook account is no longer accessible. To handle the conversion in this case, you might look into a specialised solution like TrustVare OST to PST Converter. Make sure the program satisfies your needs by reviewing its supported file conditions and features before continuing.
Open the PST file in Outlook when the conversion is finished to make sure the required emails and attachments are there.

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