Orphaned OST Issues After Domain Change

Outlook offline folders are the fastest way to work offline when connected to Exchange Server. You can configure some folders of your Exchange mailbox to be used in offline mode. These folders are stored as .ost files on the local computer. OST files serve as the mirror data image of you folders stored on Exchange Server system and require proper synchronization to update. But instances like Exchange Server crash, mailbox deletion, profile change and others might leave the file orphaned and practically unusable with Outlook. If an OST file gets orphaned, it cannot be accessed, read, and viewed in Microsoft Outlook or in any other program. Thus, it is suggested to use the previous backup to restore the file or convert orphaned ost to pst by using a third-party tool that can recover orphaned ost file.

To illustrate such scenarios, consider you use Exchange Server configuration with few users using cache mode. You might experience following sequence of behavior with this setup:

- Exchange Server system crashes down
- A client computer with the orphaned OST is connected to a new domain
- OST fails to sync


An orphaned OST cannot be connected to a new mailbox. For this to occur, following items of original and new servers should match with each other:

- MAPI profile
- Mailbox content
- OST file

The OST sync will fail if any of these items changes.

See Also:

- Convert OST to PST to Fix Synchronization Issues after Changing the Domain
- Now Utilities Available to Recover Mail Items From OST File

How to Fix this Orphaned OST Issues ?

You should deploy following suggestions to troubleshoot the behavior and convert orphaned ost to pst :

- If the original MAPI profile is configured, you can try opening the orphaned OST file in offline mode and export its contents to a PST file to access it directly. But this is feasible only when the original server is intact as requires authentication.

- Another measure could be to perform OST to PST Recovery. You can convert the orphaned OST file to a usable PST file by using third-party tools that come with suitable techniques to make a unusable Outlook Offline folder accessible through MS Outlook. OST recovery utilities read the contents of an OST files and provide options to save it as .pst files independently from Exchange Server. These tools extract all user emails, notes, journals, tasks, appointments and contacts, which can be opened in Outlook. Designed to perform safe file conversions, these tools provide easy-to-implement interface.

Try this tool to Convert Orphaned OST to PST:

Here is a reliable OST to PST conversion utility to perform safe and complete orphaned OST to PST recovery using high-end algorithms. It is an advanced tool that converts unusable Exchange OST file to a Outlook usable PST file without affecting the actual contents of the file. The tool supports Microsoft Outlook 2016, 2013, 2010, 2007, 2003, 2002, 2000, 98 and 97.

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