Windbg: investigating exceptions

The sequence shown below is:

1) !dumpheap -type Exception
2) !dumpheap -type System.Runtime.InteropServices.COMException
3) !pe 0000000006a58fb8
4) !do 0000000006a58fb8 (for some specific fields that !pe won't show)

0:000> !dumpheap -type Exception
         Address               MT     Size
0000000006961048 000007fef3336b30      136  
00000000069610d0 000007fef3336c40      136  
0000000006961158 000007fef3336d50      136  
00000000069611e0 000007fef3336e60      136  
0000000006961268 000007fef3336e60      136  
0000000006a29a90 000007fef3340298       24  
0000000006a29ac0 000007fef3340310       24  
0000000006a58fb8 000007fef335c580      136  
0000000006ac4390 000007fef335c580      136  
total 9 objects
Statistics:
              MT    Count    TotalSize Class Name
000007fef3340310        1           24 System.Text.DecoderExceptionFallback
000007fef3340298        1           24 System.Text.EncoderExceptionFallback
000007fef3336d50        1          136 System.ExecutionEngineException
000007fef3336c40        1          136 System.StackOverflowException
000007fef3336b30        1          136 System.OutOfMemoryException
000007fef335c580        2          272 System.Runtime.InteropServices.COMException
000007fef3336e60        2          272 System.Threading.ThreadAbortException
Total 9 objects

0:000> !dumpheap -type System.Runtime.InteropServices.COMException
         Address               MT     Size
0000000006a58fb8 000007fef335c580      136  
0000000006ac4390 000007fef335c580      136  
total 2 objects
Statistics:
              MT    Count    TotalSize Class Name
000007fef335c580        2          272 System.Runtime.InteropServices.COMException
Total 2 objects

0:000> !do 0000000006a58fb8
Name: System.Runtime.InteropServices.COMException
MethodTable: 000007fef335c580
EEClass: 000007fef2f4a2f8
Size: 136(0x88) bytes
 (C:\Windows\assembly\GAC_64\mscorlib\2.0.0.0__b77a5c561934e089\mscorlib.dll)
Fields:
              MT    Field   Offset                 Type VT     Attr            Value Name
000007fef3336758  40000b5        8        System.String  0 instance 0000000000000000 _className
000007fef3334b00  40000b6       10 ...ection.MethodBase  0 instance 0000000000000000 _exceptionMethod
000007fef3336758  40000b7       18        System.String  0 instance 0000000000000000 _exceptionMethodString
000007fef3336758  40000b8       20        System.String  0 instance 0000000006a591d8 _message
000007fef332dd78  40000b9       28 ...tions.IDictionary  0 instance 0000000000000000 _data
000007fef3336a20  40000ba       30     System.Exception  0 instance 0000000000000000 _innerException
000007fef3336758  40000bb       38        System.String  0 instance 0000000006a59268 _helpURL
000007fef3336048  40000bc       40        System.Object  0 instance 0000000006a59328 _stackTrace
000007fef3336758  40000bd       48        System.String  0 instance 0000000000000000 _stackTraceString
000007fef3336758  40000be       50        System.String  0 instance 0000000000000000 _remoteStackTraceString
000007fef333d9c8  40000bf       70         System.Int32  1 instance                0 _remoteStackIndex
000007fef3336048  40000c0       58        System.Object  0 instance 0000000000000000 _dynamicMethods
000007fef333d9c8  40000c1       74         System.Int32  1 instance      -2146824040 _HResult
000007fef3336758  40000c2       60        System.String  0 instance 0000000006a592a8 _source
000007fef3339160  40000c3       68        System.IntPtr  1 instance                0 _xptrs
000007fef333d9c8  40000c4       78         System.Int32  1 instance       -532459699 _xcode

0:000> !pe 0000000006a58fb8
Exception object: 0000000006a58fb8
Exception type: System.Runtime.InteropServices.COMException
Message: This command is not available because no document is open.
InnerException: <none>
StackTrace (generated):
    SP               IP               Function
    000000000013A200 0000000000000001 Microsoft_Office_Interop_Word!Microsoft.Office.Interop.Word.ApplicationClass.get_ActiveDocument()+0x2
    000000000013A2F0 000007FF00222F6E Ms_Ddue_DdueWord!Microsoft.Ddue.DdueWordAuthoring.WordHelper.GetActiveDocument(Microsoft.Office.Interop.Word.Application)+0xce

StackTraceString: <none>
HResult: 800a1098

See here for more details.