They have waited for all the bugs to be worked out and to make sure they have application compatibility with their applications. The security benefits of the newer OS far outweigh the problems. Also, most of the computers that they use are pre-installed and locked down. They are going to be running preconfigured apps. They are not going to have user installation issues.
I am sure that once 7 comes out they will migrate much faster to that than they did to Vista. Most of the migration issues are not a factor as 7 is just Vista improved and cleaned up. The transition issues from Vista to 7 will be MUCH less than it would have been from XP to Vista RTM (no service packs).
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