Fundamentals to Export Public Folder EDB to PST Outlook

admin | January 2nd, 2017 | MS Exchange & Outlook

Exchange server as we all know is a widely used mail server employed in large organizations and enterprises for calendaring purposes and to manage contacts. Initially started as a XENIX based messaging client in 1993, Exchange server took 3 years to fully develop and in 1996 tag of XENIX server was removed from it. Starting from Exchange version 5.0, there have been around 6 versions of Exchange server with Exchange Server 2016 as the latest one.

The blog is divided into sections, which describe various scenarios that lead to corruption issues in Exchange server and the methods, which can be implemented to export public folder EDB to PST Outlook. Before moving on to other sections let us just have a look on the brief overview of Exchange server database.

Exchange Server Information Store

Exchange server stores its information in Public and Private Information stores. Both the private and public stores have an EDB and a STM file associated with it.

  • Public Information StoreThe public store consists two files – pub1.edb and pub1.stm files. Pub.edb file contains all the messages sent by MAPI Client and pub.stm contains messages sent to Exchange from MIME clients. The public folder is secured by admin and only the admin defines users who have right to access the folder.
  • Private Information Store
    The private store contains information that is associated to a particular mail account. This also contains two files – priv1.edb and priv1.stm. Priv.edb files store all the messages sent by a MAPI client and priv.stm contains messages sent by MIME clients and include all the streaming data.

Corruption Scenarios In Exchange Server

There are instances when some situations lead to export public folder EDB to PST Outlook. In such situations, corruption scenarios are the major ones. Let us have a look on few of them:

  1. Dirty shutdown of Exchange server.
  2. JET Database Engine error in Exchange.
  3. Malfunction of an application in the system.
  4. Power failure leading to Exchange crash.
  5. Corruption in header of mails in the mailbox.
  6. Deletion of some mails in Exchange database.
  7. Malware infections in Exchange server

Why Export public folder EDB to PST Format?

In order to access EDB files in Outlook, we can convert them into OST as well as PST file. One advantage to export public folder EDB to PST is the factor that Outlook PST files are not MAPI-tied as OST files. By MAPIā€“tied, we mean that OST files can only be accessed in the same profile in which it is configured. Therefore, its data is restricted to that very particular profile. On the contrary, PST files can be viewed in any of the Outlook profiles. Hence, the data can be accessed in any of the Outlook profile.

Method to Export Public Folder EDB to PST

Fore sighting the various corruption issues associated with Exchange server, Microsoft itself has introduced various tools in order to export corrupted EDB files to PST. One among many is ExMerge Utility (ExMerge.exe) up to Exchange 2007 edition However, for above edition, it is recommended to utilize PowerShell command. Both are free utility and repairs corrupted EDB files and export public folder EDB to PST. It can be used to repair single, multiple or all the mailboxes stored in Exchange server mailbox.


Apart from corruption issues, users opt to export public folder EDB to PST for cross-forest migration purpose. Since EDB files are not supported in Outlook, hence they need to be converted to PST format. In the above-discussion, we have discussed a relevant way to export it.