Well, first you need to download and install
Redistributable Primary Interop Assemblies for the MS Office version you are using.

Then you should add a reference to the outlook interop assembly.

Then try this code. It's been ported from VB6 so there might be some inconsitencies.
vb.net Code:
  1. Public Sub ProcessInbox()
  2.     Dim oOutlook As Outlook.Application
  3.     Dim oNs As Outlook.NameSpace
  4.     Dim oFldr As Outlook.MAPIFolder
  5.     Dim oAttachments As Outlook.Attachments
  6.     Dim oAttachment As Outlook.Attachment
  7.     Dim iMsgCount As Integer
  8.  
  9.     Dim oMessage As Outlook.MailItem
  10.  
  11.     Dim iCtr As Long, iAttachCnt As Long
  12.  
  13.     Dim sFileNames As String
  14.     Dim aFileNames() As String
  15.  
  16.  
  17.      'get reference to inbox
  18.      oOutlook = New Outlook.Application
  19.      oNs = oOutlook.GetNamespace("MAPI")
  20.      oFldr = oNs.GetDefaultFolder(olFolderInbox)
  21.      Debug.WriteLine ("Total Items: " & oFldr.Items.Count)
  22.      Debug.WriteLine("Total Unread items = " & oFldr.UnReadItemCount)
  23.  
  24.  
  25.      For Each oMessage In oFldr.Items
  26.        
  27.          With oMessage
  28.          'basic info about message
  29.              Debug.WriteLine(.To)
  30.              Debug.WriteLine(.CC)
  31.              Debug.WriteLine(.Subject)
  32.              Debug.WriteLine(.Body)
  33.              If .UnRead Then
  34.                  Debug.WriteLine("Message has not been read")
  35.              Else
  36.                  Debug.WriteLine("Message has been read")
  37.              End If
  38.              iMsgCount = iMsgCount + 1
  39.              
  40.              'reference and save all attachments
  41.              With oMessage.Attachments
  42.                 iAttachCnt = .Count
  43.                 If iAttachCnt > 0 Then
  44.                     For iCtr = 1 To iAttachCnt
  45.                        .Item(iCtr).SaveAsFile "C:\" & .Item(iCtr).FileName
  46.                     Next iCtr
  47.                 End If
  48.             End With
  49.         End With
  50.         Application.DoEvents
  51.     Next oMessage
  52.    
  53. End Sub