Not only that, the handwriting/ink tool is extremely useful for expressing math and physics functions (all the squares, cubes, functions, free body diagrams!) Imagine the thousands of students who used to swiftly describe problems and solutions in their msn conversations suddenly being robbed of that ability!
I myself feel very disappointed with the loss of the Ink tool. I used to have loads of fun drawing cute cartoon pictures and sharing them with my friends. Most of my conversations will contain drawings because it is easy to write Chinese characters or simply illustrate our experiences and situations that we were discussing at any time.
I do not own a tablet PC, I was using my mouse all this while. Same goes for my friends and family. I just quickly looked at other sites that discuss the same thing and found Messenger Beta - Hand Writing feature
Hope that the dedicated souls at work will take notice of our complaints and bring back the ink tool!