Outlook Automation in C# Windows Application makes Problems

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C#

Windows

Outlook

automation

I have a windows application that loads contacts from outlook at the start up. After I read the contacts, Sometimes Users cannot open the Outlook, Especially it will not work at all if its connected to Exchange Server. Moreover this icon will be always showing at the right side of my taskbar..

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List<OutlookDataa> conlist = new List<OutlookDataa>();
       Microsoft.Office.Interop.Outlook.Application app = new Microsoft.Office.Interop.Outlook.Application();
       Microsoft.Office.Interop.Outlook.NameSpace ns = app.GetNamespace("MAPI");
       Microsoft.Office.Interop.Outlook.MAPIFolder contacts = ns.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderContacts);

           for (int i = 1; i < contacts.Items.Count + 1; i++)
           {
               Microsoft.Office.Interop.Outlook.ContactItem contact =
               (Microsoft.Office.Interop.Outlook.ContactItem)contacts.Items[i];
               conlist.Add(new OutlookDataa(contact.FileAs, contact.BusinessTelephoneNumber.OutlookNormalize(), contact.Business2TelephoneNumber.OutlookNormalize(),
                  contact.HomeTelephoneNumber.OutlookNormalize(), contact.CompanyMainTelephoneNumber.OutlookNormalize(), contact.MobileTelephoneNumber.OutlookNormalize()));
               //#if DEBUG
               //                         Console.WriteLine(contact.FileAs);
               //#endif
           }
           FetchFinished = true;
           contacts = null;
           ns = null;
           app = null;
           GC.Collect();