"To whom it might concern"is utilized in situations where you don't have a clue about the name of your recipient(s) and need to appear to be deferential, however in different settings, it isn't the most proper decision; and in certain minutes, it is anything but a fitting decision by any means.
"To Whom It May Concern" is a letter greeting that has generally been utilized in business correspondence when you don't have a particular individual to whom you are composing, or you don't have the foggiest idea about the name of the individual to whom you are composing.