Microsoft CRM "du jour"

I realized that, again and again, I had to go into the planning guides, rollups guides or others to get the same information about what is supported by which version of Dynamics CRM.
So, I decided to formalize and place it here so all this information is in one place.
I will try to keep it as current as possible following the different product releases.
Note that it only concerns supportability and compatibility versus Dynamics CRM and not of the other products; for example CRM 4.0 did support XP SP2 at release time but while CRM 4.0 is still in general support, XP SP2 itself is now at extended support level.

Note: Since writing that article, I found out a KB Article with the same kind of information, you can find it here