A couple of months ago I started up a micro instance of "Microsoft Windows Server 2012 RTM with SQL Server Express" AMI. I checked to see I could see the default page in IIS. And that was it. Then I forgot about it for 2 months.
When I check back I see that I've been charged about $50 each month for it. I can see that the CPU utilization has hovered around 60%, periodically spiking to 100%.
Could anybody explain to me the reason for this usage? I have ubuntu instances which have actual sites on them but their cost is nowhere near this (also micro instances).
My first thought is that it is doing windows updates. But from the CloudWatch monitor I can see that only CPU and data in is doing much of anything. There is no disk reading/writing at all.
Any light shed on this or how I might mitigate this usage would be appreciated.