Sametime 8.5.2.1 doesn't support Domino 9.
http://www-969.ibm.com/software/reports/compatibility/clarity-reports/report/html/softwareReqsForProduct?deliverableId=1314041495751&osPlatforms=AIX|IBM%20i|Linux|Mac%20OS|Solaris|Windows&duComponentIds=D002|D001|S003&mandatoryCapIds=20|40&optionalCapIds=7|71|25|27|186|223|26