Unfortunately I did not read the reviews for Duden Corrector for MS Office before but ordered blind. The same problems: The corrector slows Writer very strong, makes smooth working possible. Although work checking (no crashes) and he has a clear Besser dictionary as the attached OpenOffice spell checker, but the performance is more than lousy, also I want when typing a review, not afterwards. Also, the start time of Writer slowed significantly despite newest PC. So: a star for the very limited function. No Star for the miserable support that responds not only to e-mails, FAQ, no help.