The only difference is that 1a does not contain the
Microsoft Virtual Machine, per a civil case between
Microsoft and Sun Microsystems (the creators of Java).
If you already have SP1 installed, there is no need to
install SP1a.
If you need a java virtual machine, you can get one from http://www.java.com
They are identical except that 1a doesn't include Java (Microsoft
had to remove it by court order) and, I think, that 1a will also
uninstall Microsoft Java if it finds it. If you already have SP1,
you don't need, and should not install SP1a.
After a few lawsuits from Sun, Microsoft was forced to remove their version
of JavaVM. The only difference in SP1 and SP1a is that SP1a does not
include MS JavaVM.
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