Over the last several years DotNetNuke has maintained a policy of providing an upgrade path for users running previous versions of the platform.  Only in rare instances will we intentionally break a feature or an API or do something that would cause 3rd party extensions to break.  Customers have expressed to us over the years how important it is to maintain an upgrade path.  This concept is not unique to DotNetNuke.  Various projects and companies will take a different stance on the topic.  I was reminded of this recently with the Windows 7 launch where XP users were forced to make a tough decision – go through the hassle of installing a clean version of Windows 7 and then installing all of their old software and migrating their data (I hope grandpa had good backups), just stick with Windows XP, or move to a competitor.  Even Apple recognized the problem with the Windows 7 approach as evidenced by their Mac vs PC commercials.

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