Microsoft KB Archive/258055

= Oabgen.dll file does not post Changes.oab file to public folder =

Article ID: 258055

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q258055





SYMPTOMS
When users try to perform a differential download of the offline Address Book, those users may get a full download. If you look for the Changes.oab differential update file, the file is not in the public folder.



CAUSE
This problem can occur if the server component that generates the offline Address Book does not finish posting the changes to the public folder. If this occurs, all clients that request a differential download perform a full download. A full download can cause increased download times for the offline Address Book.



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Microsoft Exchange Server version 5.5 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:

Component: Directory



STATUS
Microsoft has confirmed that this is a problem in Microsoft Exchange Server version 5.5.



MORE INFORMATION
When either of the following two conditions exists, the Oabgen.dll file may not post the Change.oab file update to the public folder:
 * A user gains or loses a Simple Mail Transfer Protocol (SMTP) address.
 * A user's SMTP address before the at sign (@) symbol is 64 characters.

When the offline Address Book generation process begins, the full download message is correctly created and posted to the public folder. However, when the process continues and tries to create the differences message (Changes.oab), if one of the preceding conditions is met, the logic fails and the differential message is not posted. When a client requests a differential download, the client searches for the difference message. When the client cannot find the difference message in the public folder, the client performs a full download. Also note that the offline Address Book generation process does not log any errors to the application event log when the preceding conditions are met.

For more information about new behavior in the offline Address Book generation process that is important, click the following article number to view the article in the Microsoft Knowledge Base:

268324 Changing parent distinguished name lists causes corrupted offline Address Books

Additional query words: OAB

Keywords: kbbug kbfix kbqfe KB258055

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