Unipile - Easy-Integration Messaging and Email for Software Publishers.
Barracuda Email Security Gateway - Barracuda's Email Security Gateway is a powerful antivirus filter specifically designed to identify and eliminate email-borne threats, stopping hazards before they reach the network.
Google Calendar - Spend less time managing your day & more time enjoying it
Symantec Email Security.cloud - Symantec Email Security.cloud provides always-on, inbound and outbound email security against malware, targeted attacks, and advanced threats
iCal - In Calendar on your Mac, subscribe to calendars published or shared by others.
Cisco Email Security - Cisco Email Security protects against ransomware, business email compromise, spoofing, and phishing.