Copy old StickyNotes to new Windows 10 format

Copy the old StickyNotes from %appdata%\Microsoft\Sticky Notes\StickyNotes.snt


Rename StickyNotes.snt to TresholdNotes.snt


Make sure the Sticky Notes app is not open on the new computer


Create a new folder called Legacy in %localappdata%\Packages\Microsoft.MicrosoftStickyNotes_8wekyb3d8bbwe\LocalState


Put the TresholdNotes.snt file in %localappdata%\Packages\Microsoft.MicrosoftStickyNotes_8wekyb3d8bbwe\LocalState\Legacy


Open Sticky Notes and let the magic unfold (it will import the TresholdNotes.snt file into its new sqlite form)