I was just reading an interview with a representative from Emory/Goizueta business school, who was asked what kinds of mistakes people make on their applications. Get this:

The most common mistake we see is students mixing up the names of schools in the essay.

We totally realize people are applying to more than one program but this shows a lack of care. Along those same lines, candidates in an interview will do a lot of research but then ask a question whose answer is readily available on the Web or in a brochure.

If you want to get selected in a best MBA school than you should have right guidance about how to write a application letter so that your application will be accepted and you will get a best MBA schools in world.

Funny but probably true.

Sounds like it's pretty common:

"The essays can come in a variety of different forms, depending on the school. Many ask why an applicant wants to do an MBA, and why at that particular school. In general, admissions committees do understand that applicants might be applying to multiple schools, but that's no excuse for making easily-correctable mistakes.

“A funny thing is whenever somebody uses the wrong university in their essay question,” says Lord.

You should make sure you adapt your essays to specific schools, rather than sending one generic essay."

From this article:

http://find-mba.com/articles/how-to-write-mba-application-essays