Ini penyebabnya:
We’re retiring versions 6.0 to 7.5
http://www.ymessengerblog.com/blog/2009/06/09/we%e2%80%99re-retiring-versions-60-to-75/

As Yahoo! Messenger gets older so too do some of the “vintage”
versions that are still in use by some users.
In an effort to provide the best experience for our users and maintain
high security standards, we will officially retire Yahoo! Messenger
versions 6.0 through 7.5 in August, 2009. This means that if you are
currently using a version of Yahoo! Messenger that is below 8.0, you
will no longer be able to sign in and use it after the retirement date
in August.
If you are one of these users, you’ll begin seeing messages in-product
about the upcoming retirement. You have several options for continuing
to use Yahoo! Messenger:


-Yosep-


2009/9/30 J. Cahyadi <[email protected]>
>
>
>
> sepertinya yahoo memang sedang merubah protokol messenger lagi..
> tadi download ulang webmessenger versi 4.11 langsung konek lagi lancar..
> message dari yahoo admin disuruh upgrade new version juga sudah ga muncul lagi
>


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