Here is a list of the capabilities of the YMSG Protocols
| YMSG Protocol Old Servers | PM | Voice PM | Conferences | Add Friend | Server side PM Archives | Audibles | Buzz |
| V12 | Yes | Yes | Yes | Yes | NO | Yes | Yes |
| V13 | Yes | Yes | Yes | Yes | NO | Yes | Yes |
| V14 | Yes | Yes | Yes | Yes | NO | Yes | Yes |
| YMSG Protocol New Servers SP1/AC4 | |||||||
| V15 | Yes | Yes using conf | Yes | Yes | NO | Yes | Yes |
| V16 | Yes | Yes using conf | Yes | Yes | NO | Yes | Yes |
| V17 | Yes | Yes using conf | Yes | Yes | NO | Yes | Yes |
| YMSG Protocol Web Messenger | |||||||
| V102 | Yes | NO | NO | NO | Yes | NO | Yes |
V15, V16 Know longer work on the older servers after a recent yahoo change ...
Also old servers are to be turned off on August 14th 2009