whether Avast!Free Version may be used in a corporate environment?
is it legal? because i cant see that point in Avast! Free EULA 
No, you can’t use in business environments at all.
avast is free for simultaneous home and non-commercial use.
I don’t know where you looked, but it is pretty clear on the download link for avast free it is for personal and non-commercial use, see image.
ok thank you for fast respon ;D
No problem.
Welcome to the forums.
Here is the EULA for avast! Free Products: http://www.avast.es/pdf/eula-avast-free.pdf
And this is the important point:
- Permitted Use of the Software
You may install and use the Software on an unlimited number of computers. The Software must be used exclusively by you or members of your household solely for private non-commercial purposes. You may also make one backup copy of the Software.
ANY USE OF THE SOFTWARE OTHER THAN AS EXPRESSLY AUTHORIZED BY THIS SECTION OR ANY RESALE OR FURTHER DISTRIBUTION OF THE SOFTWARE CONSTITUTES A MATERIAL BREACH OF THIS AGREEMENT AND MAY VIOLATE APPLICABLE COPYRIGHT LAWS.