Yep.Yahoo still uses BSD, but earlier, a lot of work was put on BSD. There were BSD kernel teams, and teams which managed BSD ports. AFAIK, almost all of the ne

Yep.Yahoo still uses BSD, but earlier, a lot of work was put on BSD. There were BSD kernel teams, and teams which managed BSD ports. AFAIK, almost all of the new development is on RHEL and there aren't any BSD dedicated teams now. A lot of BSDs are still around - some have been running for last 10 years or so. Some new teams use BSD for their webapp deployment and database servers; can't confirm (no links) but I think the teams were of the opinion MySQL on BSD was more stable. But as said, earlier Yahoo was big time BSD, investing in it and submitting patches, which no longer is the case. Search team did a mass migration to RHEL about 2 years back. BSD is still used here and there as deployment platform. My personal preference would be to go with BSD and save some buck but apparently management views it differently.