18 Jul 2012
26 Apr 2012
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Hi Karen, I apologize that some of this is unclear, let me see if I can definitively answer this.
First of all, YES you can go from Sitefinity 3.7 SP4 straight to the current Sitefinity 5 SP1.
To clarify, when Sitefinity 4.0 was built and release, it was a complete rebuild of the product from the ground up; a new architecture, database structure, everything is brand new.
Because of this, you cannot "upgrade" from Sitefinity 3.7 to 4+ becuase they are not compatible. You can only "migrate" your content from 3.7, "importing" it into a new Siteifnity site.
However, going forward, all Sitefinity versions (4.1, 5.0, 5.1, 6.0, etc) are NOT rebuilds, they are upgrades to this new platform with new features and improvements, running the same architecture. These CAN be upgraded, because they ARE the same application, just a newer version.
And included in every version of the new Sitefinity is a Migration module that will "import" your old content (from 3.7 SP4 only) and copy it into a new website, whatever version happens to be the latest.
I hope this helps clear things up!