Was called by Indian sounding person, said his name was Patrick. Same as above re: said he was from Microsoft Security Centre, and was I sitting by my computer. I said I had to call him back, he gave me 0808 189 3307 (which is a teleconferencing service, and not a Microsoft Security Centre!).
Called at 6.30pm but it went to ansaphone and then nobody was there. I have no idea about the caller or why anybody would call me from Canada. Total nuisance!!!