Microsoft KB Archive/180858

= Cannot change the default Mail Message form =

Article ID: 180858

Article Last Modified on 1/18/2006

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APPLIES TO


 * Microsoft Outlook 98 Standard Edition

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This article was previously published under Q180858



SYMPTOMS
If you create a custom Microsoft Outlook 98 form based on the Mail Message form, when you try to set the custom form as the default form for the Inbox, you may receive the following error message:

You cannot create an item of this type in this folder.



CAUSE
The base message class (an internal property) of the custom form does not match the Inbox folder base message class.



RESOLUTION
Microsoft Outlook 2000 and Outlook 2002 allow you to directly change the default mail message form.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

241235 How to globally change the default forms in Outlook by using the Forms Administrator utility



WORKAROUND
Use one of the following approaches to work around this limitation:  Publish the form and then open that specific form when you want to use it. For more information about where to publish the form, click the following article number to view the article in the Microsoft Knowledge Base:

264118 How to determine where to publish a form

To publish the form in the Inbox Folder Forms Library, follow these steps:  With the custom form open, on the Tools menu, point to Forms, and then click Publish Form As. In the Publish Form As dialog box, and from the Look In list, select Inbox. Type a name for the form using the Display Name field, and then click OK.

To use the form, on the Actions menu, click New , where  is the name of the form that you just published.</ol> </li> If you want to programmatically manipulate incoming mail messages, there is no way to have a custom form applied to incoming mail, so you cannot use Visual Basic Scripting Edition (VBScript) code in a custom Outlook form to do this. All mail that is received will have a message class of IPM.Note and will use Outlook's default mail message form. For this scenario, use one of the following approaches: <ul> Create a separate program that runs continuously (an "agent") and periodically automates Outlook to process new items in the Inbox. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

281112 How to create a solution that runs at a specific time interval

</li> If you can program using the C/C++ language, create an Exchange Client Extension, which can manipulate incoming mail message.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/exchcli/html/_mapi1book_about_client_extensions.asp

</li></ul> </li></ol>

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MORE INFORMATION
To set a default form for a folder, follow these steps:
 * 1) Using the right mouse button, click the folder, and then click Properties on the shortcut menu.
 * 2) On the General tab, click the "When posting to this folder, use" list and click to select the form in the list. Or, you can click Forms... in the list and select your form in the Choose Form box.

If the base message class of the custom form and the folder type do not match, you will receive the error message mentioned in the Symptoms section of this article. The base message class of the form and the folder must match before you can set the form as the default form.

The table below lists the folder type and its message class. <pre class="fixed_text">  Folder Type        Base Message Class required for default form ---  Mail Items         IPM.Post Task Items        IPM.Task Appointment Items IPM.Appointment Contact Items     IPM.Contact Journal Items     IPM.Activity When creating a custom form based on the Mail Message form, the base message class is IPM.Note. This base message class is not one of the classes that you can set as default; therefore you cannot set a custom Mail Message form as default for any of these Outlook folders.

For folders other than mail item folders, this is not limiting behavior. If you are designing a custom form for a Task folder, you start with the built-in Task form which has the IPM.Task message class; therefore the base message class is compatible. The only folder type that has this limitation is the Mail Items folder type.

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