Tell me the exact steps that you have taken.
Also, tell me what error you are getting?
Use the following command (modify according to your env), execute it with apps OS owner (i.e applmgr) and send me the output.
$AFJVAPRG -classpath $AF_CLASSPATH -Dprotocol=imap -Ddbcfile=$FND_SECURE/$TWO_TASK.dbc -Dserver=outlook.office365.com -Dport=993 -Dsecurity=SSL -Dtruststore=$AF_JRE_TOP/lib/security/cacerts -Daccount=<username> -Dpassword=<password> -Dfolder=Inbox -Dconnect_timeout=120 -Ddebug=Y -Dlogfile=IMAPSSLTest.log oracle.apps.fnd.wf.mailer.Mailer
Read this one as well:
http://ermanarslan.blogspot.com.tr/2015/11/ebs-workflow-mailer-and-gmail.htmlI suspect that your problem can be related with certificates. For workflow SSL implementations, certificates errors are seen mostly. But I need to know all the details. Port used, certificates gathered imported, everyting..