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This article was previously published under Q290783
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There is no exact limit to the number of fields and controls you can use on a custom Outlook form, but Microsoft Product Support Services recommends that custom Outlook forms have fewer than 300 controls or user-defined fields, otherwise the form may not function correctly.
IMPORTANT: Although you should always create backups of a solution while it is being developed, if your form uses more than 200 fields or controls you should be extra vigilant in keeping backups.
When designing an Outlook form, you can add controls and user-defined fields to the form. In addition, you can link, or bind, the two together so that the data in the field is displayed in the control.
Outlook is designed to not have any set limits on a form's size. However, due to limitations of various software components -- both internal and external to Outlook -- forms will eventually encounter a limitation when a certain amount of controls or fields are added and you use the form in a particular way.
When problems occur with very large forms, they usually occur when you publish the form, send an item, save an item to a folder, save the form as an Outlook template (.oft), or use the Advanced Find feature on items with many custom fields. However, other scenarios may also encounter problems with very large forms or items.
Based on problem reports from customers, Microsoft Product Support recommends that forms not exceed 300 fields or controls.
NOTE: Customers have successfully created items with greater than 500 fields, but these forms had a limited number of controls. Likewise, you could theoretically create a form with more than 300 controls, but controls typically require fields to store the data associated with the controls.
There are many combinations of variables that play a role in determining when you may reach a custom form limitation. Most notable are the following:
SuggestionsThe following suggestions may help by either increasing the amount of fields or controls you can use on your form, or by reducing the total number of fields you want to use.
For additional information about form size limitations, click the article numbers below to view the articles in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/290781/EN-US/ )OL2002: Text That You Insert into Field Is Missing
(http://support.microsoft.com/kb/290784/ )Error message when you publish a large custom Outlook form that contains many controls or user-defined fields: "Unable to successfully publish the form due to a MAPI error"
197145For additional information about available resources and answersto commonly asked questions about Microsoft Outlook solutions, click the article number below to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/197145/EN-US/ )PRB: E_FAIL on SaveChanges() with Too Many Properties
(http://support.microsoft.com/kb/287530/EN-US/ )OL2002: Questions About Custom Forms and Outlook Solutions