Verb conjugation of "stärken" in German

Now I just got scared! Have I missed my own son's birthday? Luckily it is on the 19.08, exactly in a month. Man, you confused me now. Anyway, we had a great time in the mountains and the snow was great.
Could you please read the following offers in a critical manner and confirm it before I will send it? I have also mentioned the warranty and the software in the offer, because it was requested by the customer.
Please send me your email address again because the message got into the Junk Mail filter and I've accidentally deleted it. As soon as you resend it please contact me again here on this site.