I got one today too! The man claimed I had a lawsuit against me from the IRS, it was a period of 4 years and that it was 1763.00. He had a very thick Indian accent and there was a lot of noise in his background, I told him that I had trouble understanding him and he got irate with me and told me I was being recorded and to stop interrupting him. WOW. I told him that I have received nothing in the mail, he told me that information had already been sent 3 times to my home, I asked for the dates, he put me a fast hold and gave me a date in January that was a Sunday, long story short, after arguing with him that if he were indeed the IRS, they could surely send another notice and work out payments. I hung up. This scared me, he had good tactics but after he informed they would not send me another...buh-bye.
They called saying they were from World something something in California and were techies for Windows. (Odd since it's a New York number.) They said they had error reports from my computer and that all my error messages and warnings were viruses, and that no local techies could fix them. I said my computer only sends error reports to Microsoft and they said, no they were tech people for Windows viruses. They didn't seem to understand the connection between Microsoft and Windows. I wouldn't turn on the internet for them and eventually hung up on them, only to be called back by an Illinois number - 630-529-1659.
Microsoft warning about these calls - http://www.theregister.co.uk/2011/06/16/tech_support_scam_calls/
Got the call saying they were checking on a security system. Didn't ask for addditional details, Just told them not to call again. This is probably the 5th time they've called using this security thing. After seeing the different types of calls from this number, it's got to be some type of scam.