My first thought was that Sparrow was being ironic.
To expound on SuperguyA1's post: since Java is not platform specific, the theory goes that if platforms become irrelevant then the dominance of Windows could be threatened. Microsoft licensed Java from Sun so they could make their own Java VM. However, they took some things out for what they called security reasons and then added some things of their own to make Java programs run better on Windows. As a result it became possible to write Java programs which would not run on Windows and others which would only run on Windows. Sun demanded that Microsoft undo these changes, since it undermined the premise of Java ("write once, run anywhere") and went against the agreement that Microsoft had signed. When Microsoft refused, Sun sued them. The lawsuit's been dragging on for years, to the point where Microsoft made Windows XP ship with no Java VM installed. The first time you needed Java (like the "punch the monkey" ads at the top of Blue's) you had the option of installing it, but Microsoft eventually pulled that, too. Their argument was that since no matter what they did they were violating Sun's agreement, they might as well get rid of their Java VM altogether. Sun then sued AGAIN to get MS to put Java back into XP. So far, Sun seems to be winning in court - MS has been forced to integrate Sun's Java VM and pull their own.
The reason I thought Sparrow was being ironic is because as a result of all of this (the spotty availability of Java, the fact that it doesn't always work), MS has been pretty successful in undermining Java and what people think of it - many won't work in Java since "MS doesn't support it". Though at the end of the day Sun will have their way, the damage may have been done already.
Though on the flipside, it could be that Sun demanded MS put an unsafe product in their OS, demanded that they couldn't improve it without court battles, and in the end they took a Java VM which was incredibly fast and FORCED Microsoft to replace it with their incredibly slow Java VM. If Apple pulled Java, Sun wouldn't bat an eye - Apple doesn't have 90% of the desktop.
Schnapple
http://members.tripod.com/schnapple99/