new Outlook.Application() thorws error if Outlook app is running

Hi I am having similar issue

CreateObject on Outlook.Application fails on Outlook 2010 when Outlook is running under a different account

but want customized solution.

I want to sent email with attachment for which my code works but if OutLook app is already opened as desktop app, then I am getting this error.

Requirement: I want to open outlook window showing everything like when we compose message in window.

I am doing this:

Microsoft.Office.Interop.Outlook.Application outlookApp = new Outlook.Application();

Getting this error if OutLook app is running.

Error sending a report: System.Runtime.InteropServices.COMException (0x80080005): Retrieving the COM class factory for component with CLSID {0006F03A-0000-0000-C000-000000000046} failed due to the following error: 80080005 Server execution failed (Exception from HRESULT: 0x80080005 (CO_E_SERVER_EXEC_FAILURE)).
at ReportViewerControl.SendOutLookMail_Click(Object sender, EventArgs e) in c:\Projects\MSCatalog\MS SQLSERVER\Web\UserControls\Reports\ReportViewerControl.ascx.cs:line 262

When I close OutLook no error and everything works like I want. I dont want to close OutLook pro grammatically as other solutions suggested here

Just 1 more thing to mention that I am using Microsoft.Office.Interop.Outlook.dll is this 32bit/64bit problem? Or have to use some other new Dll?

The error is CO_E_SERVER_EXEC_FAILURE. Most likely this happens if the security context of your app and Outlook are different. Is either app running with elevated privileges (Run As Administrator)?