One alternative is to keep a few Solaris boxes around to run the apps. Another is to use Intel boxes and dual-boot
both Solaris and Linux; you can boot up the one you need depending upon which application you want to run. Finally, a third option is not to move to Linux, but stick with Solaris. It was recently released as open source, and you could stick with a lower-priced Solaris solution. With Sun's push to gain momentum for open source Solaris, I'm sure you can get their assistance in this matter; after all, they need success stories.
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