Question: I want to know how do I set the headers of email on click on checkboxes. I have created required checkboxes in FormRegion.

Example: 
I have checkbox named HighImportance, on click of that I want to change the email header.
I tried this, but it doesn't work:

```
private void checkBox2_CheckedChanged(object sender, EventArgs e)
{
    this.OutlookItem.Importance = 2;
}

```

Answer: 
Cast the item as a MailItem, then set its importance.

```
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
  Outlook.MailItem myMailItem = (Outlook.MailItem)this.OutlookItem;
  myMailItem.Importance = Outlook.OlImportance.olImportanceHigh
}

```
You should be using `Outlook.MailItem`. What I'm guessing you're looking for is the `Importance` property.

More info on the MailItem object here: <http://msdn.microsoft.com/en-us/library/microsoft.office.interop.outlook.mailitem_properties(v=office.14).aspx>

The values to which you can set the Importance property are listed here:
<http://msdn.microsoft.com/en-us/library/microsoft.office.interop.outlook.olimportance(v=office.14).aspx>