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RE: R5 to R6 Client upgrade question ~George Prejumisonynds 7.Jan.04 11:26 AM a Web browser Notes Client 6.0.2 CF2Windows XP
I had exactly the same problem with Notes 6.x not recognising an existing Notes 5.x installation.
Re-installing Notes 5.0.11 first (over the existing Notes 5.0.11) helped. After this the installer for Notes 6.x was working as expected.