I need to disable all notifications: iCal, Skype, and especially application updates. Everything.
I can find info on how to do this in Yosemite, but not Lion.
Would anyone know how to go about this?
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First of all, let's make sure that we are talking about Mac OS X "Lion" which is version 10.7 and not "Mountain Lion" which is version 10.8. Is this correct? This is important since Notification Center debuted in 10.8.
If you are on 10.7 then I may suggest two workarounds.
2. You may want to upgrade to "Mountain Lion" and then turn off all notifications by entering this commands in terminal:
launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist killall NotificationCenter
If you'll ever change your mind, you can then return it back by:
launchctl load -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
Hope this helps.