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This article describes how to resolve problems that are caused by duplicate free/busy folders and Offline Address Book folders or by missing site folders on a Microsoft Exchange Server 5.5 site.
Microsoft Outlook clients use Exchange Server 5.5 site folders to access free/busy information and to download the offline Address Book. Site folders are public folders that are stored under the System Folders tree. Site folders are not visible in the list of public folders in Outlook. This article describes how to resolve the problem of duplicate site folders or missing site folders.
Each site has only one free/busy information folder. You can view all the free/busy information folders for all the sites in your organization by using the Microsoft Exchange Server Administrator program that is in the Schedule+ Free Busy public folder. Each folder's display name is formatted as EX:/o=Organization Name/ou=Site Name.
Offline Address Book folders are listed under the Offline Address Book tree. Each site has only one Offline Address Book folder, and in Exchange Server 5.5, each site has an OAB Version 2 folder. The first Offline Address Book folder contains the Exchange 4.0 or the Exchange 5.0 address book for older clients, and the OAB Version 2 folder contains the Exchange Server 5.5 address book.
Duplicate site folders may be introduced to a site if you restore public folder stores that contain different site folders or if you replace an Exchange Server site's site folder globally unique identifier (GUID) with a different one. Duplicate site folders may cause the following problems:
The first server that is installed on an Exchange site becomes the default site folder server. When an Exchange site is created, a site folder GUID is generated. The GUID is a 16-byte sequence of hexadecimal characters. GUIDs are generated by an algorithm that makes it very unlikely that any other Exchange site will have the same GUID. A site folder GUID attribute is stamped on the Information Store Site Configuration object during installation, and this GUID is used by the site folder server to generate and to manage the site folders.
You can view the site folder server and the site folder attributes when you start the Exchange Administrator program in raw mode. To do this, follow these steps. Warning If you use the raw mode of the Exchange Server Administrator program (admin /r) incorrectly, serious problems may occur that may require you to reinstall Microsoft Windows NT Server, Microsoft Exchange Server, or both. Microsoft cannot guarantee that problems that result from using raw mode incorrectly can be solved. Use raw mode at your own risk.
If you change the site folder server, the new server performs the site folder checks. The site folder server performs a site folder check one time every 24 hours and one time when the Exchange Server Information Store service is started.
As a best practice, the site folder server should have replicas of the Offline Address Book folders and of the free/busy folder. If replicas of the site folders exist on the site folder server, it is unlikely that a site check will fail because folder replicas are temporarily unavailable.
The directory names of site folders are generated from the site folder GUID by using a specific algorithm. Therefore, the site folder server can read the site folder GUID and calculate what the site folder names should be. The site folder server tries to destroy site folder replicas that do not match the site folder GUID. If no site folders match the site folder GUID, the site folder server creates new site folders.
Some of the folders in the System Folders tree are not site folders. Only the free/busy folder and the Offline Address Book folders are affected by changes to the site folder GUID. If you change the site folder GUID, the Organizational Forms system folder, the EventConfig_SERVERNAME folder, and other system folders are not affected.
How duplicate site folders may be createdDuplicate site folders may be created in either of the following ways:
When a change to an object is replicated to a server, the Object-Version attribute in the change is compared to the Object-Version attribute that is already on the server. Unless the new Object-Version attribute is greater than or equal to the value that is already on the server, the change is discarded. When the values of the Object-Version attributes are equal, other attributes, such as time stamps, are used to determine if the change is discarded.
The Information Store Site Configuration object frequently has a low Object-Version attribute value, even on sites that have been active for a long time. Few configuration settings are frequently updated on the Information Store Site Configuration object. Other objects that are likely to have low Object-Version attribute values in an Exchange system have generic properties. However, the Information Store Site Configuration object is customized with the site folder GUID and the site folder server attributes when it is created.
You can prevent the site folder GUID for the Information Store Site Configuration object from being unintentionally overwritten by incrementing the Object-Version attribute of the Information Store Site Configuration object. To do this, follow these steps:
How to destroy and regenerate site foldersImportant Do not regenerate site folders unless you have exhausted all recovery methods for the replicas of the site folders or unless you specifically want to destroy the contents of the existing site folders.
When an Exchange site is created, a site folder GUID is generated. The site folder GUID is used to name and to identify the Offline Address Book folders and the free/busy folder. When a site folder check is performed, the site folders that are based on the incorrect site folder GUID are destroyed.
In Exchange Server 5.5, a subfolder of the Offline Address Book folder named OAB Version 2 exists. This folder contains the Exchange Server 5.5 version of the offline Address Book. The original Offline Address Book folder is only used in Exchange Server 5.5 for backward compatibility with servers that are running earlier versions of Exchange Server. The OAB Version 2 folder's name is not based on the site folder GUID. The site folder check cannot remove duplicate folders or OAB Version 2 folders that are not valid. However, because the OAB Version 2 folder is a child of the original Offline Address Book folder, copies of the OAB Version 2 folder that are not valid can be destroyed when the site folders are regenerated.
If you have problems with duplicate site folders, and the site folder check has not been able to resolve the problems, you can reset the site folder GUID. Before you reset the site folder GUID, you can follow these steps to make the process faster and more reliable:
Note If you confine all replicas to the site folder server, a site folder check may be successful, and you do not have to reset the site folder GUID.
You can use the Guidgen.exe utility to generate a new site folder GUID. If there are duplicate site folders, clients from some servers may have published their free/busy information to one of the folders, and clients from other servers may have published their information to another folder. In these situations, a temporary loss of some free/busy data may occur when you try to resolve the problem.
Warning If you change the site folder GUID, you must never restore previous backups of any public folder store in the Exchange organization. If you do this, you may cause the following problems:
To reset the site folder GUID and delete all the offline Address Books and the free/busy information in a site, follow these steps:
(https://support.microsoft.com/kb/152960/ )Reassigning site roles after removing the first server in an Exchange site
Article ID: 326637 - Last Review: January 11, 2015 - Revision: 2.4