[ExchangeList] Exchange 2000 Upgrade

Greetings to all, I am running exchange 2000(SP3 I believe) on Windows
2000 SP/4 on an engineering test environment. 
I was doing some research on DST and it appears that there is no patch
for e2k available. 

My questions are: 
Do I need to upgrade to e2k3? 
If so, I need to upgrade the OS  windows 2003 first? 
In what order do I do the upgrades of all 4 servers? 
I have one routing group that includes all four. 

Thanks for your help. 
Juan

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