注：定义变量

Outlook.Application myOlApp = new Outlook.ApplicationClass();
Outlook.NameSpace myNameSpace;
Outlook.MAPIFolder myFolder;

一、添加联系人

Outlook.ContactItem addItem = (Outlook.ContactItem)myOlApp.CreateItem(Outlook.OlItemType.olContactItem);
addItem.FirstName = "晶晶";
addItem.LastName = "李";
addItem.Email1Address = "sun@sohu.com";
addItem.Save();

二、删除联系人

Outlook.ContactItem contact =
    this.myOlApp.GetNamespace("MAPI").
GetDefaultFolder(Outlook.OlDefaultFolders.olFolderContacts).
Items.
Find(
string.Format("[LastName]='{0}' AND [FirstName]='{1}'",
lastName, firstName))
as Outlook.ContactItem;

if (contact != null)
{
    contact.Delete();
}

三、查询联系人

myNameSpace = myOlApp.GetNamespace("MAPI");//得到MAPI的Session
            myFolder = myNameSpace.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderContacts);// 获取默认的邮箱信息

int iMailCount = myFolder.Items.Count;
            if (iMailCount > 0)
            {
                for (int k = 1; k <= iMailCount; k++)
                {
                    Outlook.ContactItem item = (Outlook.ContactItem)myFolder.Items[k];
                    if (!columnMobiles.Contains(item.MobileTelephoneNumber))//添加数据库不存在的联系人
                    {
                        string lastName = item.LastName;//姓
                        string firstName = item.FirstName;//名
                        string fullName = item.FullName;//全称
                        //string sex = item.Gender.ToString();//性别
                        string email = item.Email1Address + "," + item.Email2Address + "," + item.Email3Address;//Email