system
1
Take a look at OPSWAT Security Industry Market Share Report March 2011 
nmb
2
Seems there are great oscillations from one trimester to another…
avast has already acknowledged that something is fishy in the sampling (the universe of Opswat public).
Anyway, good for global market share. Congratulations 
system
4
I mostly use CNET for software reviews, popularity, download numbers and ranking. I use both CNET’s review and users’ reviews.
Version: 6.0
[b]Date added: February 23, 2011[/b]
Price: Free to try (30-day trial); $49.99 to buy (Buy it now)
Operating system: Windows 2000/XP/Vista/7
Total Downloads: 992,506
Downloads last week: 6,512
[b]Product Ranking: #4 in Internet Security Software Suites[/b]
http://download.cnet.com/Avast-Internet-Security/3000-18510_4-75095376.html
If you look at their rankings for 5.0.594 which has been available for quite a while you get
Version: 5.0.594
Date added: July 01, 2010
Price: Free to try (30-day trial); $59.95 to buy
Operating system: Windows 2000/XP/Vista/7
Total Downloads: 399,041
Downloads last week: 19,375
[b]Product Ranking: #1 in Internet Security Software Suites[/b]
[url=http://download.cnet.com/Avast-Internet-Security/3000-18510_4-11438767.html]
http://download.cnet.com/Avast-Internet-Security/3000-18510_4-11438767.html[/url]