So let us have a quick look at the software, its features, and how you can use it to recover your emails from OST files. It can also export the mailbox items, such as emails, attachments, contacts, notes, tasks, journals, etc., from an OST file directly to a live Exchange Server mailbox or Office 365. The software converts encrypted, inaccessible, and orphaned OST files of any size to PST with 100% integrity and precision. In such cases, a third-party OST to PST converter software, such as Stellar Converter for OST, comes in handy. Other issues, such as synchronization failure or errors caused by Exchange database dismount or server failure, could lead to a permanently inaccessible OST file as Outlook fails to reconnect to the Exchange server.

Such OST files are referred to as orphaned OSTs.

Furthermore, if your MAPI profile is deleted or disabled from the Exchange server, you cannot access your emails stored in the OST file as authorization fails. Thus, an OST file and its content cannot be opened, accessed, or imported into any other Outlook profile. Also, the OST file is encrypted with MAPIEntry GUID key and hence, requires authorization from the MAPI profile to access the emails and other data. This provides a seamless and lag-free user experience. The changes are later synchronized with the mailbox on the server as soon as the system connects to the internet. It allows user to access their Outlook emails and do certain changes, even when the system is offline.

The OST file stores mailbox items, such as emails, contacts, attachments, notes, journals, etc. OST is an Outlook data file created by Outlook when you set up or configure Exchange server account and enable the Offline mode (Cached Exchange Mode).

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