Revision = Bug fixes, no breaking changes, small improvements.Minor Version = Bug fixes, new libraries.Unfortunately reality and marketing names haven't always matched, but going forward I think we all agree that: The community is always concerned about breaking changes, much like we are here with. NET 3.5 both upgraded the system (and CLR) in place as well.

NET 4.5 vs.NET 4 is as different as Rick implies. Rick has a great post with a lot of detail and information. NET 4.0 runtime and leaves the actual version number set at v9. The 4.5 update instead completely replaces the. NET 2.0 runtime which wasn’t changed (other than for security patches and bug fixes) for the whole 3.x cycle. The two 3.x versions were basically library enhancements on top of the core. NET 2.0 and 3.0/3.5 which all ran on the 2.0 version of the CLR. Note that this in-place replacement is very different from the side by side installs of. NET 4.5 is still the v4CLR and adds new libraries as well as improvements to the core CLR itself. In-place upgrade means that the CLR is the same but new libraries are added as well as bug fixes and performance improvements: NET can live together on the same machine. Side-by-side means that different versions of. There are 'side by side installs' and there are 'in place upgrades.' A major version means side-by-side and a minor version means in-place. I do think that things are getting better and becoming less confusing.NET 4.5 is a step in the right direction of transparency in versioning. I'm not going to tell you it's not confusing today. Meetings were had and those small updates now have simpler names versions like NET 4.0.1, etc. I was most concerned about some 'platform updates' to. NET and Microsoft Product Versioning that got the attention of some folks.

O_oīack in July of 2011 I wrote a post on Issues with. It's not the magic of Java Version 6 Update 31 (build 1.6.0_31-b05) but it's a start. NET 3.5SP1 they've been trying to get it right. NET Framework versioning, since the confusion of. Say what you will about the past ridiculousness of.

.net framework 4.5 win xp