There have been some questions about how updating your Flash could have anything to do with inputting text for your messages. In fact Flash doesn’t play a role in text input, but it does touch on some other aspects of the All-New Yahoo! Mail. Most notable would be the Chat/Messenger feature (which has been around for a while), but there are some other components too. Some existing and some new stuff.
So while we have no intention of changing Mail to some sort of Flash based tool, we’ve also found that some users can improve the experience and resolve some bugs we’ve discovered by upgrading to the latest Flash version.
We fully intend that anything we add or change in no way conflicts with the core functions of Mail (inputting text would be an example) and our engineers are working to resolve it. However, I also wanted people to know that updating Flash could improve it that much faster.
Hope that clears up some of the confusion.