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This article provides a quick reference for troubleshooting Microsoft Exchange client offline folders (.ost files).

More Information


OST - Offline Folder Storage - A file that contains a local replica of a user's Microsoft Exchange Server-based folders (private and public) and forms. The OST is synchronized with the Microsoft Exchange Server copy for use while working offline. An OST is specific to a particular mailbox and cannot be accessed by other users of Microsoft Exchange Server.

PST - Personal Folder Storage - A file that may contain folders, messages, forms, files and other items. You can create any number of PSTs for use with a single profile. You can also designate a PST as the delivery location for incoming mail.

New Client Installation - If you are installing the Microsoft Exchange client for the first time, during the profile creation you will be asked if you travel with the computer. If you answer yes, an Offline Store provider is set up for you and a file, Exchange.ost, is created. The OST is where the offline folders will be stored.

Existing Client Installation - If this is an existing installation of the Microsoft Exchange client, you can create an offline store using the Offline Folder File Setting button in the Advanced tab of the Microsoft Exchange Server driver property page. If multiple users will be using a single computer, each user needs his or her own OST file.

Creating an OST

How to make a server-based folder available for offline use:

  1. Open the folder property sheet; click the folder and on the File menu, click
  2. Click the Synchronization tab and click Available Offline or Online.
After you make a folder available offline, you can easily synchronize that folder by using the commands found under Synchronize in the Tools menu.

How to disable an OST:

  1. Open the Mail Control Panel.
  2. Click the Microsoft Exchange Server service and click Properties.
  3. Click the Advanced tab, and then click Offline Folder Settings.
  4. Click Disable Offline Use. You may also want to rename the OST file on the local computer.
How to compress an OST:

  1. In Control Panel, double-click Mail.
  2. Click the Microsoft Exchange Server service and click Properties.
  3. Click the Advanced tab, and then click Offline Folder Settings.
  4. Click Compact Now.
How to compress a PST:

  1. In Control Panel, double-click Mail.
  2. Click the Personal Folders service and click Properties.
  3. Click Compact Now.
When to use an OST or a PST:

An OST is the preferred method for offline storage, because it allows you to use public folders and organizational forms while you work offline. Because an OST acts as a copy of Microsoft Exchange Server-based folders, the data is backed up during the standard Microsoft Exchange Server backup procedures.

NOTE: The OST is a replica. It is not a backup, and cannot be restored.

A local PST must be backed up by the individual owner. One advantage a PST has is the ability to use the remote e-mail features of the Microsoft Exchange Client, download headers, move or copy messages, delete unwanted messages before downloading, and read new messages while others are downloading. When you use an OST, the synchronization process is not multi-threaded.

OST Sync Log:

During the OST synchronization process, a log file is kept, and it is placed in the Deleted Items folder at the completion of synchronization. This log file is very useful in determining synchronization details and error messages. The following are some of the error messages and possible causes:

8004010f - This error message may be caused by any of the following reasons:

  • You have changed the language of the Organization Forms registry after the OST was created.

  • You have two Microsoft Exchange Server sites, where the first has an Organization Forms registry and the second does not. Unless public folder affinity is set correctly, users in the second site is not able to open the Organization Forms registry and receives this error message.

  • You added an Organization Forms registry, but it was later removed. You need to recreate an Organization Forms Library, and then restart the Exchange Server services for the server hosting the mailbox, and synchronize the client again twice.
80030070 - This error message is returned when there is no space left on the disk. Free up hard disk space and try again. You may be trying to synchronize some large attachments.

80040115 - A network error prevented successful completion of the operation. Complete some basic remote procedure call (RPC) network troubleshooting.

User's mailbox deleted from Microsoft Exchange Server:

Because an OST is stamped with a mailbox's unique ID, if a user's mailbox is deleted and re-created on the computer running Microsoft Exchange Server, the OST file does not synchronize with the new mailbox. The only way to recover the data in the OST is to use the following steps exactly before starting the client online:

  1. Start the Microsoft Exchange Client in offline mode, using the same profile that was used before with the OST.
  2. Add a PST to the profile.
  3. Copy the messages to the PST.
  4. Create a new profile that connects to the new mailbox.
  5. Move the messages from the PST to the new mailbox.

Номер статьи: 161889 — последний просмотр: 22 июня 2014 г. — редакция: 1

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