Progress - of a sort! It turns out the issue indeed has nothing to do with Tycho - I realized I've tweaked the location properties on Windows in an attempt to prepare to support installation into c:\Program Files post-XP: 
 
 
 
 However moving the osgi.configuration.area out of the installation folder (which defaults to c:\myapp :P) is what causes my p2 problem. 
 
 Seems I have to hunt down some articles on multi-user installs and c:\Program Files on Vista onwards... 
 
 Regards, Justin 
 
 
 Is that a Windows product built on Windows? My Mac product built on the Mac updates fine... ;) but not the win product built on macosx 
 
 I've got it building with 0.17.0 thanks to Jan's tip - however the Windows product still doesn't know where to update from :(  I've also tried fully qualifying the action (org.eclipse.equinox.p2.touchpoint.eclipse.addRepository) but again no change. 
 
 Where do the p2.inf addRepository instructions get saved in the output product? I think it would be good if I can confirm that my macosx product has them and the win32 one indeed doesn't, no? 
 
 Many thanks, Justin 
 
 
 
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