I'm an excel expert and I and created several tools for process improvement project with the use of microsoft excel (functions and VBA Macro).
One of my project that I am very proud of was the Statement of Account Generator. A tool that will automatically create and send statement of account (excel format) to a list of client.
I've been working in the BPO industry for more that 6 years and that is where I learned my skills in MS excel. I learn it on my own with the help of my friend (google).