She is addressed as Mrs. Obama. (Dear Mrs. Obama:) You would not refer to her as Michelle, which would be rude (too casual-- you don't know her); and there is no terminology called "Mrs. First Lady," so don't use that either. Also, when addressing the envelope, "Mrs. Michelle Obama" is correct, according to several experts on etiquette.
You are writing a business letter, you should be more formal.
Yes, cover letters should include both your address and the address of the recipient, typically placed at the top of the letter.
Answer You should be able to tell by what they say in the letters. The fact that they are writing you letters says they like you.
Use the address of the school as the to address, and your own home address as the from address.
Capital letters.
When writing a formal business correspondence, you should start your letters with the recipient's contact information, followed by the date, and then your own contact information.
Differentiate between solicited and un-solicited letters
When writing recommendation letters, you should highlight specific qualities such as leadership skills, academic achievements, work ethic, and personal character traits that demonstrate the individual's abilities and potential for success.
If you are writing a business letter, you should begin with the date. After that comes the person's name, title, and address.
Capital letters and full stops.
Receivers address on the right. I do not think a return address is necessary. I believe the rest of the format should be like writing a note or a letter.
To ensure correct letter writing, one should follow proper formatting, use appropriate language and tone, check for spelling and grammar errors, and address the recipient accurately. It is also important to proofread the letter before sending it.