Last year we created the Dynamics CRM 2013 Left Navigation. This changed the new navigation that came with Dynamics CRM 2013 to return to a vertical layout, including a scrollbar and also being more “sticky”.
We’ve made couple of improvements, you can now install this as a solution into Dynamics CRM 2013, 2013 SP1 and CRM 2015 online, on-premise or partner hosted environments.
The Left Navigation solution can be downloaded here from Codeplex. Please note that this is unsupported!