So say recruiters in the Wall Street Journal’s career site:
"It is staggering the frequency of typos, grammatical errors and poorly constructed thoughts we see in emails that serve as letters of introduction," says Mr. Aisenbrey. "We still see a tremendous amount of email from students who are writing to the recruiter like they are sending a message to a friend asking what they are doing that evening."
It’s a balancing act: while you want to maintain some level of professionalism in communications, you also don’t want to bounce to the other extreme which is MBA jargon-speak.
If I think of the evolution of my own writing style, it started with casual, IM kind of talk (not good), then when I started my business I bounced to the lawyerly / ultra professional tone (also not good), and now I strive for somewhere in the middle: casually authoritative.
I write as if I’m wearing jeans and a collared shirt, not a ripped t-shirt and shorts, or tuxedo and bow tie.