Question: When will we be able to have cross compatibily between yahoo and msn messengers? When will we be able to send messages from yahoo messenger to msn messenger???

Answer: These are made by two different companies and they are competitors of each other.  It may take awhile my friend.  However, you may want to check out Trillian.  It's one messenger and can consolidate your AIM, Yahoo! Messenger, MSN mesenger, ICQ, and more.
This question from the Yahoo Q&A forum is categorized in the topic: Education & Reference