[gknoy]

You're right that taking the time to proofread and grammar/spell check is good, but in this particular case the performance is that of your company. Thus, "company's" is correct. :-)

The other is probably a typo, which might lend authenticity to it having been actually typed out by the CEO, rather than pasted from an archive.

[guiseppecalzone]

I've heard that misspellings can actually improve the response rate. I'd believe that - felt more personal to me.

[stretchwithme]

Authenticity. That's a great point. It could still be faked authenticity, of course :-)