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A list of links to the system requirements pages for various Notes/Domino versions.
Guide for Upgrading to HCL Notes/Domino 12.0.2 and Newer (including 14.0)
A good document for planning and completing your upgrade from older versions of Notes/Domino to version 12.
There is also an older guide for are also older guides for upgrading to HCL Notes/Domino 12 and upgrading to HCL Notes/Domino 11.
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