In IBM Lotus Notes 8.5.1, a new spell check engine is enabled by default. If
you want to revert back to the legacy version of spell check, add
SPELL_FORCE_LEGACY=1 to your notes.ini file.
Lotus Notes clients, beginning with 8.5.1
The default setting is 0 (new spell check dictionary is enabled).
SPELL_FORCE_LEGACY=0 / 1
Lotus Notes/Domino 8.5.1