As described in Obsolete ATL Topics, the following classes have been renamed.
| Old name | New name |
| CComConnectionPointContainerImpl | IconnectionPointContainerImpl |
| CComConnectionPoint | IconnectionPointImpl |
| CComDynamicArrayCONNECTDATA | CcomDynamicUnkArray |
| CComStaticArrayCONNECTDATA | CcomUnkArray |
For information about supporting connection points in ATL 2.1, see the article Connection Points.