Adobe had released a fix for the problem in transferring keywords when you update to Lightroom v2.0, previously reported here.
“Keywords from Photoshop Lightroom 1.x not included on export from Photoshop Lightroom 2.
When you update your catalog to Photoshop Lightroom 2, the Include On Export keyword tag option is not selected, so if you export your photos from Photoshop Lightroom 2, your keywords are not exported with your photos.”
solution: Lightroom fix
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