We are preparing to upgrade to the latest version of Confluence (5.10.3) at the time of this writing, but when I performed the 'Add-In' check I discovered that the 'Code Macro Plugin' is not available for this version (there are others, but we figured we can do with out, so we just disabled them). The code macro plug in is used through out our pages. Even if I could just go through and convert it to just HTML or something, I wouldn't even know how to find all of the pages where the macro was being used.
I really hope someone has some good news for me on this. These types of things cause us to reconsider using any of the plug-ins because we never know when they will no longer be supported.