They aren't phasing anything out--but support does end much earlier for the Home products, and other versions based on them, which include Media Center, for example.
http://support.microsoft.com/lifecycle/?p1=3221
Not sure this link will work, but mainstream support for XP Home ends April 14, 2009.
Extended support ends April 8, 2014, though, and security fixes are issued through extended support life.
I don't know how this relates to a WGA update, though.
"robinb" <(E-Mail Removed)> wrote in message news:(E-Mail Removed)...
> ahhh I was right! it is xp pro only.
> I am betting they did this because microsoft is only supporting xp pro till
> 2014-not xp home
> I am wondering if they are trying to phase xp home out
> robin
>
> "Randy Knobloch" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> robinb wrote:
>>> it is Kb905474 and it popped up all by itself today but- it seems to be
>>> popping up only for xp pro machines.
>>>
>>> I just went on 4 of my clients computers running xp home and I am not
>>> seeing
>>> this on any of their machines unless MS is sending out it for xp pro only
>>> or
>>> first?
>>>
>>> anyone see this on their xp home machines?
>>
>> XP Pro only, Robin >
>> <http://support.microsoft.com/kb/905474>
>>
>>
>> --
>> Randy
>> <http://msmvps.com/blogs/siljaline/default.aspx>
>>
>>
--