When writing a letter, is "vous" written with a capital "V"/

Merci!

Only when it is the first word of a new sentence!

Sra (aka Mme)

Merci beaucoup.

In French, the pronoun "vous" is usually written with a capital "V" when it is used formally as a way to address someone respectfully or to refer to a group of people. This capitalization is a sign of courtesy and politeness.

However, when "vous" is used informally to address someone as a single person, such as when talking to a friend or family member, it is not capitalized.

To determine if you should capitalize "vous" in a letter, consider the level of formality you want to convey and the nature of your relationship with the recipient. If the letter is intended for a formal or professional setting, it is generally advised to use the capitalized form. On the other hand, if the letter is more informal or personal, the lowercase "vous" might be more appropriate.

It's always a good idea to consider the context and purpose of your letter to make the right choice regarding the capitalization of "vous."