There has been no official announcement to NAI's customers or its channel partners, but Jeff Jones, global vice-president of marketing for NAI's PGP security division, said: "Many of these products were targeted at the low-end NT market and we're finding that these customers are just not buying software at the moment."
Windows NT still makes up 30% of the server operating system market, according to analysts group IDC, but Microsoft regards it as a "legacy" operating system, with Windows 2000 gaining market share.
NAI has yet to provide a definitive list of the ten products due to be phased out. However, it has confirmed that the award-winning Cybercop Monitor and Sting will go. The company's line of network sniffer products will also be shrunk with the end of development work on DOS Sniffer, Network Informant and Network Health.
The move emerged last week when George Samenuk, NAI chairman and chief executive officer, told financial analysts that some products would be phased out as part of "a full review of the company's product line".
Many analysts are surprised that Cybercop Monitor will be dropped. It is highly respected and has a significant user base worldwide.
NAI's Jones told CW360.com: "I can't tell you how many users will be affected but I can say that these products make up less then 5% of our revenue."
Jones promised NAI would support the affected products until the end of 2002, "which is a lot more than you'd get from some rival vendors".
He suggested that NT users were buying more security appliances and were waiting for migration to Windows 2000 or XP before investing in security software.
The NAI website and the company's distributors were this week still selling products that will be dropped. A distributor, who asked not to be named, said: "We have yet to be officially told about these products being discontinued."