I've been reading some threads regarding this subject but still didn't got fully clear! Today I have 2 DC's running WS2k8 R2. Our DFL is Windows Server 2003 and our FFL is Windows 2000.
We are planning to raise it all to Windows Server 2008 R2 level. I've seen the matrix where it says Exchange 2003 has to have SP2, which in fact we have it fully updated.
So, assuming this, can I proceed with raising the FFL and DFL? I'm worried because I don't want to "lose" Exchange, nor have huge headaches! :)