Officially, the CMSMS core always has, and still supports Postgres (at least postgres 8 ). We rarely see any complaints from people that use CMSMS with postgres, however those few that do complain tend to be loud and vocal

The dev team tests and fixes bugs wrt postgres as an afterthought (simply because none of the dev team use it on a daily basis). We also know that many modules will not work 'out of the box' with Postgres. largely for the same reason, the developers don't use it.
But since we're in this decision making process, and we had no real (scientific or otherwise) statistic to tell us exactly what portion of our user community uses CMSMS with Postgres, we thought we'd put it out to the community to give us some feedback.
This poll will run for about 30 days, and I hope that we get enough information that we can make an informed decision about postgres, rather than a decision based on our casual observance. So please respond.
Thanks
The Dev Team.