It's easy..
Ignoring all the retarded comments from the retards..
What do you have installed;
Service Pack 2 - Nothing changes, support as normal.
Service Pack 1 - Nothing changes, support as normal (but you should install the latest).
No service pack - You're 22 months behind with updates released by Microsoft to the point where they will no longer offer you any further UNTIL you update to one of the above.
Nothing outragous, scandelous or shameful here..