Seems like what I've wished would exist on N900, although it'd be nice to be able to set a flag on the meeting whether it will silence the phone or not. I know that it doesn't exist by default, but as a crude example it'd be nice to have an option to maybe for the application to parse the meeting description, and if it has for example the string "(S)" in the meeting description, then it would silence the phone. Then you'd have control over what to silence and what not for the people who don't want to have all the meetings to change the profile. This is just from the top of my head, so probably someone can come up with a better way to implement this.