Problem with Setup Email Notifications on Dell OpenManage

I'd like to configure the e-mail alert for my esxi 5.5 dell server with OMSA.
When i access the Alert Management section on the Dell Open Management, i got the following messagges:
"This feature is not available on this system due to operating system or hardware limitations. Refer to the online help for more information"
Im using OM-SrvAdmin-Dell-Web-7.4.0-876.VIB-ESX55i_A00.zip, open manage server installed on DELL PowerEdge 2900 server.
OM-SrvAdmin-Dell-Web-WINX64-7.4.0-866_A00 this is the client (running on W2k12).
Best regards.
Fabio Filippi.