The "LCMapString" function may return incorrect mapping results for some languages in Windows Server 2008 and in Windows Vista

In Windows Server 2008 and in Windows Vista, the LCMapString function may return incorrect mapping results for some languages.

Because of this issue, Exchange Server 2007 may enter an infinite loop when certain users connect to their mailboxes. Eventually, this behavior may consume all disk space, and the mail server may stop responding.

The LCMapString function is used to pass a locale, an input string, and a string length. If the string length parameter is specified, the input string cannot be null-terminated.

If the locale uses double compression, the system checks the next character to verify this double compression during the conversion. However, the system does not check whether the double-compressed locale exceeds the specified string length. If the locale string is null-terminated, no problem occurs. However, if the locale string ends on a page boundary, the system may crash.

Hotfix information

A supported hotfix is 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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

To apply this hotfix, the computer must be running one of the following:

• Windows Server 2008
• Windows Vista Service Pack 1

Restart requirement

You must restart the computer after you apply this hotfix.

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 item in Control Panel.

Windows Server 2008 and Windows Vista file information note

The MANIFEST files (.manifest) and MUM files (.mum) that are installed for each environment are listed separately. MUM and MANIFEST files and the associated security catalog (.cat) files are critical to maintaining the state of the updated component. The security catalog files are signed with a Microsoft digital signature. (The attributes of these files are not listed.)

All supported x86-based versions of Windows Server 2008 and of Windows Vista

All supported x64-based versions of Windows Server 2008 and of Windows Vista

All supported Itanium-based versions of Windows Server 2008 and of Windows Vista

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about the LCMapString function, visit the following Microsoft Developer Network (MSDN) Web site: For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

Additional file information for Windows Server 2008 and for Windows Vista

Additional files for all supported x86-based versions of Windows Server 2008 and of Windows Vista

Additional files for all supported x64-based versions of Windows Server 2008 and of Windows Vista

Additional files for all supported Itanium-based versions of Windows Server 2008