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I'm creating an application that is reading emails received in outlook. The reading process is something like this: using Outlook = Microsoft.Office.Interop.Outlook; var app = new Outlook.Application(); var ns = app.GetNamespace("MAPI"); ns.Logon(null, null, false, false); var inboxFolder = ns.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderInbox); var subfolder = inboxFolder.Folders["MyFolderName"]; foreach (Outlook.MailItem item in subfolder.Items) { // do something // item.EntryID } I need to get an unique ID for every item in the foreach loop. There is a EntryID property in Outlook.MailItem that I used and it was working well, but I found out there was a problem with that property: Whenever I moved the email to another folder (inside outlook), This property EntryID changed. I ran several tests and discovered that the EntryID value changes only a few chars when I move the mail to another folder. I need an ID that would be unique no matter what folder. Is there an another property from Outlook.MailItem or any substring of EntryID that is always unique? I'm using: .NET 4.0; Outlook 2010; Microsoft.Office.Interop.Outlook.dll version 14.0.0.0.

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