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dia 0.96 released with basic Microsoft Visio VDX format support
This was released for quite some already, not sure how I missed it. :-D
When I looked for the updates on GIMP 2.4 (it's rc3 now) today, I found that dia 0.96 was released, but with an interesting new feature: the addition of support on Microsoft Visio Drawing XML (*.vdx) format .
1. Version 0.96 of Dia released:
http://gnomedesktop.org/node/2985