One of the uses we have for Confluence is to use it as a reference to documentation held on our network drives. This is an essential piece for functionality for us. I recently upgraded our Confluence instance from 3.5.1 to 4.2.5 and this had the effect of un-rendering all of the network hyperlinks and causing them to be displayed as text.
An example of the types of urls that encountered a problem are:
{noformat} /////network_drive/folder1/folder2 {noformat}
and
{noformat} //C:/folder1/folder2 {noformat}
and
{noformat} network_drive folder1 folder2 file.doc {noformat}
and here is a real one
{noformat} here| selanas02 ECUSystemDesign Systems Engineering Team Customer-independent Projects Presentations Demo_FrequencyResponseInvestigation_28Feb2012.pptx {noformat}