I want to be able to use MAPIFolder.Items.Restrict() to return me a
collection of items that my program has not yet processed. After I
process items, I mark them w/ a custom string UserProperty that I set
to a GUID.

"If you are trying to use the Find or Restrict methods with
user-defined fields, the fields must be defined in the folder,
otherwise an error will occur."-MSDN
(http://msdn.microsoft.com/library/de...HV05247704.asp)

What is the proper way to add my UserProperty to the MAPIFolder such
that I can use the Restrict method to return me the results I'm looking
for?

What query string should I pass to Restrict() that would get me all
Items that are not marked w/ my string GUID?

Thanks!
Jeff

Create a new PostItem in the folder.
Add a property to it with UserProperties.Add. (The default is to add it to the folder as well)
Delete the PostItem.

--
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx

"Jeff" <(E-Mail Removed)> wrote in message news:(E-Mail Removed)...
>I want to be able to use MAPIFolder.Items.Restrict() to return me a
> collection of items that my program has not yet processed. After I
> process items, I mark them w/ a custom string UserProperty that I set
> to a GUID.
>
> "If you are trying to use the Find or Restrict methods with
> user-defined fields, the fields must be defined in the folder,
> otherwise an error will occur."-MSDN
> (http://msdn.microsoft.com/library/de...HV05247704.asp)
>
> What is the proper way to add my UserProperty to the MAPIFolder such
> that I can use the Restrict method to return me the results I'm looking
> for?
>
> What query string should I pass to Restrict() that would get me all
> Items that are not marked w/ my string GUID?
>
> Thanks!
> Jeff
>

What exactly need to be done to the MailItem for this to work?

I have the following code (C#):
dummyMailItem.UserProperties.Add("Dummy", Outlook.OlUserPropertyType.olText,
true, System.Type.Missing);
dummyMailItem.Subject = "Dummy";
dummyMailItem.Body = "Dummy";
dummyMailItem.To = "(E-Mail Removed)";
dummyMailItem.Save();
//dummyMailItem.Delete();

However, the mail item isn't added to the folder, and the user property
isn't added as user propertiy column.

Why not?

Create a PostItem in the folder, not a MailItem, and use True for the third parameter of UserProperties.Add.

--
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx

"P Hoppe" <(E-Mail Removed)> wrote in message news:AB4F94F7-1E62-458F-A5FD-(E-Mail Removed)...
> What exactly need to be done to the MailItem for this to work?
>
> I have the following code (C#):
> dummyMailItem.UserProperties.Add("Dummy", Outlook.OlUserPropertyType.olText,
> true, System.Type.Missing);
> dummyMailItem.Subject = "Dummy";
> dummyMailItem.Body = "Dummy";
> dummyMailItem.To = "(E-Mail Removed)";
> dummyMailItem.Save();
> //dummyMailItem.Delete();
>
> However, the mail item isn't added to the folder, and the user property
> isn't added as user propertiy column.
>
> Why not?
>

Thanks,

That Wasn't logical but it did the trick.