When we were purchased by IBM (admittedly it's been a while), our separate HR, finance, IT and legal groups were gone before we knew it. Engineering got integrated over the first year (when I left), but with a pretty light touch, and AFAIK took into the second year to complete. Apparently things got increasingly more "IBM-ified" over the years, but a suprising number of the core folks have stayed, so it can't be all misery. Maybe RH won't be completely crushed.