Microsoft KB Archive/875525

= When you use the Outlook Web Access client to open a compressed (.zip) file attachment that you downloaded from an Exchange Server 2003 computer, the file is corrupted =

Article ID: 875525

Article Last Modified on 10/25/2007

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APPLIES TO


 * Microsoft Exchange Server 2003 Standard Edition
 * Microsoft Exchange Server 2003 Enterprise Edition

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SYMPTOMS
When you use the Microsoft Office Outlook Web Access client to open a compressed (.zip) file attachment that you downloaded from an Microsoft Exchange Server 2003 computer, the file is corrupted. You receive the following error message:

The Compressed (zipped) Folder is invalid or corrupted.



CAUSE
This problem may occur if the following conditions are true:
 * Your Outlook Web Access front-end server has forms-based authentication enabled.
 * Gzip data compression is enabled for Outlook Web Access.

When the content-encoding is &quot;application/zip,&quot; the gzip filter compresses and may corrupt the attachment when the client downloads the e-mail message from the Outlook Web Access server.



Service pack information
To resolve this problem, obtain the latest service pack for Exchange Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

836993 How to obtain the latest service packs for Exchange Server 2003

Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Prerequisites
To install this hotfix, you must have Exchange Server 2003 Service Pack 1 (SP1) installed. For additional information about how to obtain Exchange Server 2003 Service Pack 1, click the following article number to view the article in the Microsoft Knowledge Base:

836993 How to obtain the latest service packs for Exchange Server 2003

Restart requirement
You do not have to restart your computer to install this hotfix. However, the following Exchange and Microsoft Internet Information Services (IIS) services are automatically restarted when you install this hotfix:
 * World Wide Web Publishing Service
 * Simple Mail Transport Protocol (SMTP)
 * Microsoft Exchange Routing Engine
 * Microsoft Exchange POP3
 * Microsoft Exchange IMAP4
 * IIS Admin Service

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version            Size    File name --  18-Aug-2004  03:25  6.5.7232.27     1,086,976  Davex.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Exchange Server 2003 Service Pack 2.



MORE INFORMATION
For additional information about how to enable gzip compression in Exchange Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:

830827 How to manage Outlook Web Access features in Exchange Server 2003

For additional information about Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

817903 New naming schema for Exchange Server software update packages

Additional query words: XCCC gzip

Keywords: kbqfe kbhotfixserver kbexchange2003presp2fix kbfix kbbug KB875525

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