An old OST file can contain important emails, attachments, contacts, and other mailbox information, but accessing it can become difficult when the original Exchange or Microsoft 365 account is no longer available.
This situation can occur after changing computers, removing an Outlook profile, leaving an organization, or losing access to the mailbox that created the OST file. Simply opening the OST file in Outlook may not work because OST files are normally associated with their original account and profile.
Before trying to recover the data, it is a good idea to create a backup copy of the original OST file. The copy can then be examined without risking the original data.
For users who need to recover information from an inaccessible OST, an OST to PST Converter can be useful. A recovery-oriented converter can scan the OST file, identify available mailbox folders and messages, and allow the data to be reviewed before exporting it to PST.
EdbMails is one option that provides OST recovery and conversion capabilities. It can scan and preview data from offline or orphaned OST files and export recoverable mailbox information to PST when required.
You can learn more about the OST to PST Converter and the recovery process here.
After conversion, it is also worth checking the resulting PST in Outlook to verify important folders, emails, attachments, and the folder structure before considering the recovery complete.