I think the only practical way to change reference version in an existing project to an earlier version would be to manually edit the .vbp file (make sure that you work on a backup), but that will still involve getting GUID info from another project's .vbp
The version of the references that you find in Project/References relates to the version of Outlook, Word, Office or whatever that you have installed on your machine.
The upgrade is to install an up-to-date version of Office
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If you want to get the best response to a question, please check out FAQ222-2244 first
'People who live in windowed environments shouldn't cast pointers.'