Spell Check Improvements
In the IBM® Lotus Notes® 8.5.1 standard client: Notes®, embedded Lotus® Symphony™, and embedded Lotus Sametime® will all use same spell checking engine and same set of language dictionaries.
Also, Notes and embedded Symphony will share one user dictionary by default. (supported for all platforms). So if a user defines a word in the Notes user dictionary or the embedded Symphony default user dictionary(standard.dic), that word will not be marked as misspelled in either Notes or embedded Symphony.
Read some more tidbits here.