It is best for detecting malware, suspicious files or any malicious activity within your organization's network. I really like this product because it is very easy to use and it has a lot of options which makes it quite flexible. You can also easily integrate it with other tools such as Microsoft Forefront Threat Management Gateway. Sometimes it gets slower than expected especially when you have large networks, but this is not that much of an issue. We are using it internally in our company to detect viruses, malware, suspicious files and malicious activities within our network and internet connection.