FaceTime for Mac makes it easy to talk, smile and laugh with friends and family on their iPhone 4, iPad 2, iPod touch or Mac.
iMessage lets you send messages to anyone on a Mac, or an iPhone, iPad, or iPod touch running iOS 5.
This is a messenger app based on the MTProto protocol.
MSN Messenger will not be available to update anymore since it has been embedded into Skype. Microsoft bought the Skype corporation and discontinued the Messenger application. You might need to download Skype to keep using IMs.
Microsoft Messenger was bundled into Skype. You cannot download the standalone version of the product anymore. You can download Skype and make video calls.
There is no Automator Workflow for Microsoft Messenger, but you have the possibility to create one. Access the Apple support page and use the presented example to create one workflow for the Microsoft Messenger. Unfortunately, this is the only way to create a workflow project for Microsoft Messenger.
Video option is available for Skype because MSN Messenger is not available anymore since it has been bundled into Skype.