Getting STANDARD Html from Outlook mailbody

See more:

C#

WinForms

Outlook

AddIn

I am working on a Outlook AddIn where I have to get the Outlook mailbody and store it in a control which can be manipulated for my requirement.
The code is like this:

Outlook.Application oApp = new Outlook.Application();
Outlook.Explorer oExplorer = oApp.ActiveExplorer();
Outlook.Selection oSelection = oExplorer.Selection;
foreach (object item in oSelection)
{
htmlEditor1.Html = mailItem.HTMLBody;
}

I checked for htmlbody format using

oldMailItem.BodyFormat.ToString();

It is giving olFormatHTML which is different from standard HTML.

How I can get the standard HTML from Outlook ?