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  If you create an HTML-based form, publish that HTML-based form to a Web server, and then you enable Web services in Outlook, Outlook checks for the availability of an HTML version of the form. Outlook then opens the form in your Web browser. Typically, this feature is seldom used, but this feature may be enabled in some organizations.

If a form cannot be found in any one of the previous locations, the item appears in the standard form for that type of item. For example, a standard e-mail message form may be used instead of a custom e-mail message form, or a standard contact form may be used instead of a custom contact form.

When Outlook checks for an updated form, the last-modified time of the form in the cache is compared to the last-modified time of the form in the original location. If the original location contains an updated form, Outlook downloads the updated version and then updates the forms cache.

Locate the forms cache

You may locate the forms cache in the following folder:

C:\Documents and Settings\<user_name>\Local Settings\Application Data\Microsoft\FORMS</user_name>

Outlook 2003 supports roaming users. Therefore, the forms cache location may change. The forms cache location depends on what user is currently logged on to the computer. You cannot configure user setting to indicate where the forms cache is located. Therefore, you cannot directly change the location of the forms cache to a location other than the default location.

Understand the forms cache architecture

ÊÔè§ÊӤѭ¹ÕéÊèǹ ÇÔ¸Õ ËÃ×ͧҹ»ÃСͺ´éÇ¢Ñ鹵͹·ÕèºÍ¡ÇÔ¸Õ¡ÒÃá¡éä¢ÃÕ¨ÔÊ·ÃÕ ÍÂèÒ§äáçµÒÁ »Ñ­ËÒÃéÒÂáçÍÒ¨à¡Ô´¢Öé¹ËÒ¡¤Ø³»ÃѺà»ÅÕè¹ÃÕ¨ÔÊ·ÃÕäÁè¶Ù¡µéͧ ´Ñ§¹Ñé¹ â»Ã´µÃǨÊͺãËéá¹èã¨ÇèҤسä´é·ÓµÒÁ¢Ñ鹵͹àËÅèÒ¹ÕéÍÂèÒ§ÃÐÁÑ´ÃÐÇѧ ÊÓËÃѺ¡Òûéͧ¡Ñ¹à¾ÔèÁàµÔÁ ãËéÊÓÃͧÃÕ¨ÔÊ·ÃÕ¡è͹·Ó¡ÒûÃѺà»ÅÕè¹ à¾×èÍ·Õè¤Ø³¨ÐÊÒÁÒö¤×¹¤èÒÃÕ¨ÔÊ·ÃÕä´éËÒ¡ÁջѭËÒà¡Ô´¢Öé¹ ÊÓËÃѺ¢éÍÁÙÅà¾ÔèÁàµÔÁà¡ÕèÂǡѺÇÔ¸Õ¡ÒÃÊÓÃͧ¢éÍÁÙÅáÅФ׹¤èÒÃÕ¨ÔÊ·ÃÕ â»Ã´¤ÅÔ¡·ÕèËÁÒÂàÅ¢º·¤ÇÒÁµèÍ仹Õé à¾×èÍ´Ùº·¤ÇÒÁã¹°Ò¹¤ÇÒÁÃÙé¢Í§ Microsoft::

The forms cache contains the Frmcache.dat file. The Frmcache.dat file contains summary information and pointers to both the default Outlook forms and any custom forms that you use. Cached copies of custom forms are stored in subfolders of the Forms folder.

The subfolders of the Forms folder are randomly named. However, the names of the subfolders look similar to the names of the forms. The actual forms that are stored in these folders are cryptically named, but the forms have a .tmp file name extension. If you do not know the folder that contains the copy of a particular form, you can use the time stamp of the folder or the time stamp of the form to help you locate the form.

Outlook also stores the registry keys that correspond to custom forms that have been cached. The registry keys are at the following location:



In earlier versions of Outlook, the forms cache did not keep track of where a form came from when the form was cached. For example, assume that you have two different forms that are published in two different public folders, and both forms have the same name. If you access the first folder, the form in that folder is cached. Then, if you access the second folder, Outlook still uses the cached form from the first folder, and not the form that is in the second folder. This means that every form name (or Message Class field) is supposed to be unique to prevent conflicts when you use forms. This has been the forms-cache design since Microsoft Outlook 97 was released.

The forms cache changed in Outlook 2003. In Outlook 2003, information about the folder and the forms library is also cached. This change was made because of a security-related issue. For example, you may have ten different public folders in Outlook 2003, all with the same form name that is published in the ten folders. In earlier versions of Outlook, the form was cached one time, and then Outlook used the same form from the local forms cache every time because all the forms had the same name. However, Outlook 2003 caches the form from each folder.

Understand and change the forms cache size

By default, Outlook sets a limit of 2048 kilobytes (KB) for the maximum size of the forms cache. To change this setting, follow these steps:

1. 㹡ÒÃà¤Ã×èͧÁ×ÍàÁ¹Ù ¤ÅÔ¡µÑÇàÅ×Í¡.
2. ¤ÅÔ¡¡ÒÃÍ×è¹ æá·çº áÅéǤÅÔ¡µÑÇàÅ×Í¡¢Ñé¹ÊÙ§.
3. ¤ÅÔ¡Custom Forms, type a number that is greater than 2048 underMaximum space on hard diskáÅéÇ ¤ÅÔ¡µ¡Å§.

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ËÁÒÂà˵Ø:¢¹Ò´¢Í§á¤ª¿ÍÃìÁ¶Ù¡¨Ñ´à¡çºäÇéã¹á¿éÁ Frmcache.dat ÃٻẺ¢Í§á¿éÁ Frmcache.dat ¤×Í undocumented äÁèʹѺʹع¡ÒûÃѺà»ÅÕè¹á¿éÁ Frmcache.dat â´ÂµÃ§ ´Ñ§¹Ñé¹ ¨ÐäÁèÁÕÇÔ¸Õ¡ÒÃà»ÅÕè¹¢¹Ò´¢Í§á¤ª¿ÍÃìÁâ´Â·Ò§â»Ãá¡ÃÁ Microsoft äÁèʹѺʹع»ÃѺà»ÅÕè¹â´ÂµÃ§ä»ÂѧÊèǹã´Êèǹ˹Ö觢ͧà¹×éÍËҢͧâ¿Åà´ÍÃì¿ÍÃìÁ¨¹¡ÇèÒàªè¹¡ÒÃà»ÅÕè¹á»Å§ä´éÃѺ¡Òúѹ·Ö¡äÇé â´Â Microsoft ËÃ×Íá¹Ð¹Ó â´ÂºÃÔ¡ÒüÅÔµÀѳ±ì¢Í§ Microsoft ʹѺʹعÊÓËÃѺ¡ÒÃá¡é䢻ѭËÒà·èÒ¹Ñé¹ ¡è͹·Õè¤Ø³·Ó¡ÒûÃѺà»ÅÕè¹㴠æ ã¹à¹×éÍËҢͧâ¿Åà´ÍÃì'¿ÍÃìÁ'ä´é ¤Ø³µéͧ·ÓÊÓà¹Ò¡ÒÃÊÓÃͧ¢éÍÁÙŤÃÑé§áá

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  µÃǨÊͺÇèÒ ÃÒ¡Ò÷Õèãªé¿ÍÃìÁ one-off
  
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  µÃǨÊͺÇèÒ ¤Ó¹ÔÂÒÁ¢Í§áºº¿ÍÃìÁ¶Ù¡à¡çºÍÂÙèã¹ÃÒ¡ÒÃä´éà¹×èͧ¨Ò¡ÍÒ¨·ÓãËéà¡Ô´ÅѡɳСÒ÷ӧҹ·ÕèäÁè¤Ò´¤Ô´ «Öè§ÍÒ¨·ÓãËé¤Ø³äÁè¶Ù¡µéͧ presume ÇèÒ »Ñ­ËҢͧ¤Ø³à¡ÕèÂÇ¢éͧ¡Ñº¡ÒÃᤪ¿ÍÃìÁ
  
  ÊÓËÃѺ¢éÍÁÙÅà¾ÔèÁàµÔÁà¡ÕèÂǡѺ ¿Ñ§¡ìªÑ¹ one-off ÊÔ¹¤éÒ ¤ÅÔ¡ËÁÒÂàÅ¢º·¤ÇÒÁµèÍ仹Õéà¾×èÍ´Ùº·¤ÇÒÁã¹°Ò¹¤ÇÒÁÃÙé¢Í§ Microsoft:
  290657  (http://support.microsoft.com/kb/290657/ ) OL2002: ¡Ò÷ӧҹ¡Ñº¢éÍ¡Ó˹´áºº¿ÍÃìÁáÅпÍÃìÁ one-off
• ÇÔ¸Õ·Õè 2
  
  µÃǨÊͺÇèÒ »Ñ­ËÒ·ÕèäÁèà¡ÕèÂÇ¢éͧ¡ÑºË¹èǤÇÒÁ¨Ó
  
  outlook äÁèÍÒ¨»ÅèÍ¿ÍÃìÁ¨Ò¡Ë¹èǤÇÒÁ¨Ó This problem may be related to how you implement Visual Basic Scripting Edition code in a custom form. If Outlook does not unload the form from memory, you may have to exit and then restart Outlook. This removes the form from memory and forces Outlook to reload the form from the cache, the forms library, or a folder.
  
  You must also verify that Outlook exits. You can use Microsoft Windows Task Manager to verify that Outlook is not running. However, Microsoft recommends that you restart your computer to make sure that the problem is not related to something that occurs in memory.
  
  If Outlook does not exit, this may be the cause of the forms cache problem. If the form contains Visual Basic Scripting Edition code, try to determine if there is something in the form that causes Outlook not to exit. Also, disable any COM add-ins or any non-standard Microsoft Exchange extensions. Either of these may be contributing factors.

Åéҧᤪ¿ÍÃìÁ

There are different methods that you can use to clear the Outlook forms cache. Each method has advantages and disadvantages.

• ÇÔ¸Õ·Õè 1:
  
  Microsoft recommends that you use the Clear Cache method. â´ÂãËé·ÓµÒÁ¢Ñ鹵͹µèÍ仹Õé::
  1. 㹡ÒÃà¤Ã×èͧÁ×ÍàÁ¹Ù ¤ÅÔ¡µÑÇàÅ×Í¡áÅéÇ ¤ÅÔ¡¡ÒÃÍ×è¹ æá·çº
  2. ¤ÅÔ¡µÑÇàÅ×Í¡¢Ñé¹ÊÙ§.
  3. 㹡ÒõÑÇàÅ×Í¡¢Ñé¹ÊÙ§¡Åèͧ ¤ÅÔ¡Custom Forms.
  4. 㹡ÒÃCustom Forms¡Åèͧ ¤ÅÔ¡Manage Forms.
  5. 㹡ÒÃForms Manager¡Åèͧ ¤ÅÔ¡Clear Cache.
• ÇÔ¸Õ·Õè 2
  
  If you are an advanced user, you can also resolve problems with the forms cache by manually renaming or manually deleting specific components of the cache that may be causing a problem. For example, if you are having a problem with a specific form, you can start by deleting the corresponding folder for that cached form.
• ÇÔ¸Õ·Õè 3
  
  You can also rename the Frmcache.dat file. Do not do this as your first attempt to resolve a problem with the forms cache because the Frmcache.dat file may contain information about other forms. However, if your other efforts to clear the forms cache have failed, you can rename the Frmcache.dat file and then restart Outlook.
• ÇÔ¸Õ·Õè 4
  
  You can investigate the registry keys. The registry keys are at the following location:
  
  
  HKEY_CURRENT_USER\Software\Classes\CLSID
  
  
  Typically, the registry keys do not play a role in forms cache problems, but they do contain information about cached forms. If all other efforts to correct a problem form fail, you can verify that this section of the registry contains information about the form. You can remove the information about the form, and then restart Outlook.

ãªé¤ÕÂìÃÕ¨ÔÊ·ÃÕ ForceFormReload

When the forms cache seems to cause problems sporadically, and you cannot determine the cause of the problem, you can to set theForceFormReloadregistry key in Outlook. àÁ×èÍ¡ÒÃForceFormReloadregistry key is enabled, and Outlook encounters an error when opening an item that is based on a custom form, Outlook automatically clears the cache for this specific form. Then, Outlook tries to open the item again. While this method does not correct the cause of the forms cache problem, this method does make the problem transparent to people who use custom forms.

àÁ×è͵éͧ¡ÒÃà»Ô´ãªé§Ò¹¹Ñé¹ForceFormReloadregistry key functionality, follow these steps:

1. àÃÔèÁâ»Ãá¡ÃÁ Registry Editor
2. Click the following key in the registry:
   
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\11.0\Outlook
3. 㹡ÒÃá¡éä¢àÁ¹Ù ¤ÅÔ¡Add ValueáÅéÇ à¾ÔèÁ¤èÒÃÕ¨ÔÊ·ÃÕµèÍ仹Õé:
   ÂغµÒÃÒ§¹Õé¢ÂÒµÒÃÒ§¹Õé

   ª×èͤèÒ:	ForceFormReload
   ª¹Ô´¢éÍÁÙÅ:	Reg_DWORD:
   ¢éÍÁÙŤèÒ:	1

4. ÍÍ¡¨Ò¡â»Ãá¡ÃÁ Registry Editor
   
   ËÁÒÂà˵Ø:This functionality is also available in Outlook 2000 and Outlook 2002 if you have the latest service packs installed.
   
   For additional information about how to obtain the latest service packs, click the following article numbers to view the articles in the Microsoft Knowledge Base:
   285129  (http://support.microsoft.com/kb/285129/ ) OL2000: Error Message: The form you have selected...cannot be displayed, please contact your administrator
   305403  (http://support.microsoft.com/kb/305403/ ) OL2002: Error Message: The form you have selected...cannot be displayed, please contact your administrator

¡ÒÃá¡é䢻ѭËÒ੾ÒТͧ¿ÍÃìÁ·ÕèÍÒ¨à¡Ô´¢Öé¹àÁ×èͤسà»Ô´ÃÒ¡ÒÃ

If a problem occurs when you try to open an item that is based on a specific custom form, the problem may be related to problems with that specific form and not to the forms cache itself. The following methods describe how to troubleshoot problems with a specific form. You must do the methods in the order that they are listed.

• ÇÔ¸Õ·Õè 1:
  
  You can disable the custom Visual Basic Scripting Edition code in the form. This may indicate to you that the problem is related to the Visual Basic Scripting Edition code. To do this, hold down the SHIFT key when you open an item. This prevents the Visual Basic Scripting Edition code from running.
• ÇÔ¸Õ·Õè 2
  
  You can remove all the controls from all the form pages. Custom controls on the form may have problems initializing and may prevent Outlook from opening a form. The following reasons can prevent Outlook from opening a form:
  • The custom controls are not installed on the local computer.
  • The licensing registry key is incorrect.
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• ÇÔ¸Õ·Õè 3
  
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• Outlook 2003 ËÂØ´¡Òõͺʹͧà»ç¹ÊÒà˵آͧ»Ñ­ËÒ¡ÒõÑ駪×èÍâ¿Åà´ÍÃì
  
  àÁ×èÍ Outlook à¡çº¿ÍÃìÁ·Õè ÁÕª×èÍà´ÕÂǡѹ«éÓ Outlook äÁè¤Çü¹Ç¡â¤Ã§ÃèÒ§ÅӴѺàÅ¢ä»Âѧâ¿Åà´ÍÃìÃкºä¿Åìã¹á¤ª¿ÍÃìÁ â¤Ã§ÃèÒ§·ÕèÁÕ¡ÒáÓ˹´ËÁÒÂàÅ¢¹ÕéÁÕª×èÍá¿éÁ·Õè supposed ä» incrementally ËÁÒÂàÅ¢·Õè¢Öé¹µé¹ ´éÇ 001 áÅÐ à¾×èÍ·Ó¡ÒáÓ˹´ËÁÒÂàÅ¢µÒÁÅӴѺµèÍä» ÍÂèÒ§äáçµÒÁ Outlook 2003 ÃØè¹ááäÁè¨Ñ´¡Òê×èÍá¿éÁä´éÍÂèÒ§¶Ù¡µéͧ â¿Åà´ÍÃì·ÕèÁÕª×èÍäÁè¶Ù¡µéͧ ËÅѧ¨Ò¡áºº¿ÍÃìÁ·Õè¶Ù¡á¤ªËéÒ¤ÃÑé§ ¿ÍÃìÁᤠ6 ÅéÁàËÅÇ «Ö觷ÓãËé Outlook ËÂØ´¡Òõͺʹͧ
  
  ¡ÒõÃǨÊͺÇèÒ »Ñ­ËÒ¹Õéà¡Ô´¢Öé¹ µÃǨÊͺ᤿ÍÃìÁº¹ÎÒÃì´´ÔÊ¡ìã¹Ãкº â´Â»¡µÔ àÊé¹·Ò§¢Í§á¤ª¿ÍÃìÁ¨Ðà»ç¹´Ñ§¹Õé:
  
  C:\Documents áÅÐ Settings\ <username>\Local Settings\Application Data\Microsoft\FORMS</username>
  
  äÁèÁÕâ¿Åà´ÍÃìÊÓËÃѺáµèÅпÍÃìÁ·Õè¶Ù¡á¤ª ª×èÍâ¿Åà´ÍÃì·ÕèÊÍ´¤Åéͧ¡Ñº¿ÔÅ´ì¤ÅÒʢͧ¢éͤÇÒÁ¢Í§¿ÍÃìÁ ËÒ¡»Ñ­ËÒ¹Õéà¡Ô´¢Öé¹ ¤Ø³ÊÒÁÒö´ÙÈÙ¹Â켹ǡà¢éҡѺª×èÍâ¿Åà´ÍÃìã¹µÑÇÍÂèÒ§µèÍ仹Õé:
  
  IPM.Contact.FormName
  IPM.Contact.FormName00000
  IPM.Contact.FormName0000
  IPM.Contact.FormName000
  IPM.Contact.FormName00
  
  ãªéÇÔ¸Õ¡ÒÃÅéҧᤪ¡ÒÃÅéҧᤪ¿ÍÃìÁ »Ñ­ËÒ¹Õé¨Ðá¡é䢻ѭËÒä´éªÑèǤÃÒǨ¹ ¡ÇèÒÃٻẺà¾ÔèÁàµÔÁ¶Ù¡á¤ áÅéÇ »Ñ­ËÒà¡Ô´¢Öé¹ÍÕ¡¤ÃÑé§
  
  â»Ãá¡ÃÁá¡é䢴èǹ·Õè¾ÃéÍÁãªé§Ò¹ÊÓËÃѺ»Ñ­ËÒ¹Õéä´é ¤Ø³ÊÒÁÒöµÔ´µèͼÅÔµÀѳ±ìºÃÔ¡ÒÃʹѺʹعà¾×èÍ¢ÍÃѺâ»Ãá¡ÃÁá¡é䢴èǹä´é â»Ãá¡ÃÁá¡é䢴èǹ¹Õé¨ÐÁÕ¡ÒáÓ˹´àÇÅÒ·Õè¨ÐÃÇÁã¹ Outlook 2003 Service Pack 1
• ÁջѭËÒà¡Ô´¢Öé¹àÁ×èͤسà¢éÒ¶Ö§â¿Åà´ÍÃìÊÒ¸ÒóРâ´Âãªéâ¿Åà´ÍÃì'ÃÒ¡ÒÃâ»Ã´'
  
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  • ¤Ø³ãªéºÒ¹Ë¹éÒµèÒ§¹Ó·Ò§¢Í§ÃÒ¡ÒÃâ¿Åà´ÍÃìà¾×èÍ´Ùâ¿Åà´ÍÃì Outlook ·Ñé§ËÁ´ áÅШҡ¹Ñé¹ ¤Ø³à¢éÒ¶Ö§ÃÒ¡ÒÃâ»Ã´·Õèâ¿Åà´ÍÃì
  • ¤Ø³ãªéºÒ¹Ë¹éÒµèÒ§¹Ó·Ò§ÊÓËÃѺª¹Ô´¢Í§ÊÔ¹¤éÒ àªè¹»¯Ô·Ô¹ËÃ×ͼÙéµÔ´µèÍ áÅФسãªéâ¿Åà´ÍÃì <itemtype>Í×è¹ æ ÃÒ¡Òâͧâ¿Åà´ÍÃì¹Õé¨Ðà¡ÕèÂÇ¢éͧ¡Ñº¡ÒÃãªéâ¿Åà´ÍÃì'ÃÒ¡ÒÃâ»Ã´'</itemtype>
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  â»Ãá¡ÃÁá¡é䢴èǹ·Õè¾ÃéÍÁãªé§Ò¹ÊÓËÃѺ»Ñ­ËÒ¹Õéä´é ÍÂèÒ§äáçµÒÁ µÔ´µÑé§á¾¤à¡¨â»Ãá¡ÃÁá¡é䢴èǹ¡àÅÔ¡ã¹ÀÒÂËÅѧà¹×èͧ¨Ò¡á¾¤à¡¨â»Ãá¡ÃÁá¡é䢴èǹ¡àÅÔ¡ã¹ÀÒÂËÅѧÃÇÁ¶Ö§Î͵¿Ô¡«ìà¡ÕèÂÇ¢éͧ¡Ñº¡ÒÃᤪÍ×è¹ æ ¹Í¡à˹×ͨҡ¡ÒÃá¡é䢴èǹ¹Õé
  
  833856  (http://support.microsoft.com/kb/833856/ ) outlook 2003 ᾤࡨâ»Ãá¡ÃÁá¡é䢴èǹ: 20 Á¡ÃÒ¤Á 2004
  â»Ãá¡ÃÁá¡é䢴èǹ¹Õé¨ÐÁÕ¡ÒáÓ˹´àÇÅÒ·Õè¨ÐÃÇÁã¹ Outlook 2003 Service Pack 1
• ¤ÇÒÁÅéÁàËÅÇà¡Ô´¢Öé¹àÁ×èͤسãªé¤ÕÂìÃÕ¨ÔÊ·ÃÕ ForceFormReload
  
  outlook 2003 ªèÇÂãËé¤Ø³ÊÒÁÒöµÑ駤èÒ·ÕèäÁè¨Óà»ç¹forceFormReloadÃÕ¨ÔʵÃÕ¤ÕÂì ã¹ Outlook ÃØ蹡è͹˹éÒ¹ÕéforceFormReload¤ÕÂìÃÕ¨ÔÊ·ÃÕ¶Ù¡ãªé¶éÒäÁèä´éâËÅ´¿ÍÃìÁ outlook źÃÒ¡ÒáÒÃᤪ¿ÍÃìÁÊÓËÃѺẺ¿ÍÃìÁ¹Ñé¹â´ÂÍѵâ¹ÁÑµÔ áÅоÂÒÂÒÁà»Ô´áºº¿ÍÃìÁ «Öè§â´Â·Ò§ÍéÍÁªèÇÂàËÅ×Íá¡é䢨ӹǹ¢Í§¿ÍÃìÁ·ÕèÁÕ¡ÒÃÊØèÁ seemingly ᤪ»Ñ­ËÒ·Õèà¡Ô´¢Öé¹ ÍÂèÒ§äáçµÒÁ ¶éҤسãªé¡ÒÃForceFormReloadregistry key with Outlook 2003, Outlook 2003 may crash.
  
  There is a hotfix that is available for this problem. You can contact Product Support Services to obtain the hotfix. This hotfix is scheduled to be included in Outlook 2003 Service Pack 1.
• Outlook incorrectly caches a form two times
  
  Outlook may incorrectly cache a form two times. This can eventually lead to a damaged forms cache.
  
  There is a hotfix that is available for this problem. You can contact Product Support Services to obtain the hotfix. This hotfix is scheduled to be included in Outlook 2003 Service Pack 1.
• Organizational Forms library problems and cached mode problems occur
  
  There are a variety of problems where Outlook does not cache custom forms correctly. These problems occur in scenarios that are related to offline mode, to cached mode, and to losing connection to the server. Most of these problems are related to publishing a form in the Organizational Forms library. However, the scope of the problem may be greater and may include any form that is published in another location. These problems are scheduled to be addressed in Outlook 2003 Service Pack 1, but these problems do not have hotfixes that are associated with them.
• Outlook Find command problem occurs
  
  If you use the Outlook Find command to filter the items that appear in a folder, and you open an item, the item may not appear using a custom form that the item is supposed to use. This is not a forms cache problem, but may be confused with a forms cache problem.
  
  There is a hotfix that is available for this problem. You can contact Product Support Services to obtain the hotfix. This hotfix is scheduled to be included in Outlook 2003 Service Pack 1.