OST to PST converstion.

If the OST file belongs to an existing Outlook/Exchange profile, you may be able to recreate the profile and export the mailbox to PST through Outlook. However, if the OST is orphaned, inaccessible, or the original Exchange account/profile is no longer available, Outlook itself generally cannot directly open and export that OST to PST.

In that situation, a dedicated OST conversion tool can be used. EdbMails OST to PST Converter is one option worth considering. It can extract mailbox data such as emails, attachments, contacts, calendars, and folder structure from OST files and export it to PST.

It also offers a free trial, free software upgrades, and does not impose a file-size limit on OST-to-PST conversion. The trial is useful for checking whether the required mailbox data can be recovered before purchasing.

The right approach depends mainly on whether the OST is still connected to the original Outlook profile or is an orphaned/inaccessible file.