There are three errors in that short sentence. Did you spot them, or does it look fine to you? The problem is that, while you may see no flaws, the person receiving your letter, report or CV might write you off after the first few words.
"Dear John, thankyou for you're kindness in agreeing to meet with Michael and I."
Not everyone has the opportunity to go back to college and study, or even the time to read grammar books - although if you do I would recommend anything by David Crystal. You can also look at my Suite101 articles on common grammatical and punctuational errors:
How to Improve Your Written English
Direct Speech and Quotations
However, you may find that it is worth spending the small amount of time or money required to have your work looked over by a professional writer with recognised qualifications in English Language. Why damage your chances with written work that doesn't reflect your true worth and abilities?
...you could pay me to write it for you. I will write grammatically correct, impressive pieces in your chosen style and format. This does not mean I will write essays which you can pass off as your own! If that's what you're thinking, you'd better try a less scrupulous site. If either the proofreading or the writing service interests you please get in touch to discuss your requirements. Email me here.