I think that by October the whole company has to migrate to OpenOffice, and then I think it's by June next year we all migrate to Linux - you don't want to migrate 6,000 people both operating system and office suite in a single jump. ↗
In some cases we've been building tools that are specific to Linux for the desktop, and they only work on Linux, but I see two major projects that are wildly, wildly successful: Mozilla and OpenOffice, and those two programs are cross platform. ↗