We are looking for a tool, free would be ideal :), which can allow us to send network annoucements to the computers on our network from the IT Department.
We have seen several tools with good price tags, but on a limited budget, want to be able to issue alerts centrallly to around 500 clients on 150 different subnets. However, I do not want the users to be able to use this as an IM tool as I am sure it will be mis-used immediately.
All of our computers are currently Windows XP SP3, but are introducing Windows 7 very slowly. Servers are a mix of 2003 and 2008 versions.
What tools can be recommended for this?