I say, if it ain't broke, don't
"fix" it.
Read some of the ASync problems with WM2003, among others. If you've got an X5 Basic, upgrade to A03, if you've got an X5 Advanced, go for the A04.
I just read too many problems after folk have "
upgraded" to WM2003 to make it worth it for me to take the risk.
If you're eligible for the CD, get it, just don't use it............
unless & until something comes along that will correct WM2003/A00, that requires it to be installed first.
Personally, I think it will be WM200X and not an A00 Update. I know there's already been a Patch for X3s that Dell calls an Update, but it is X3 specific, not WM2003 in general.
So........if it ain't broke...........
Just My 2