As an enthusiastic MS Excel user, I have developed a precise eye for detail, an essential quality for ensuring the impeccable sorting and separation of millions of SMS messages like the task you are presenting. I understand the given project completely: it cannot be automated nor outsourced via code, and with this knowledge, I assure you no time will be wasted trying to tackle it in those ways.
My extensive experience with Excel, coupled with my genuine interest in your task, makes me the perfect fit for this project. Over the years, I've organized and managed massive Excel data sets with exceptional accuracy and speed, meeting strict deadlines without compromising quality. Streamlining your 10 workbooks into 12 categorized sheets is right up my alley.
As a diligent student who prioritizes regular practice to sharpen my Excel skills, I commit between 8-10 hours a day to effectively managing large data sets. Precisely because I am accustomed to handling heavy workloads, working through your million-rowed workbooks will not daunt me. In sum, I guarantee meticulous attention to detail, efficient results achievable within your timeline and finally, thorough and complete effort leading to a satisfactory completion of the task. I hope my profile and conviction convince you of my potential in serving your data organization needs well. Thank you for considering my application and best of luck in making the perfect choice for your project!