You might see some serious inter-corporate face slapping over this one: a recent update to Microsoft anti-spyware led to two versions of Symantec's anti-virus software being wrongly labelled as Trojan horse malware! Symantec AntiVirus Corporate Edition and Symantec Client Security packages were mistakenly identified by Windows AntiSpyware beta 1 as the Bancos-A Trojan, a password stealing malware.
Symantec is working with affected customers, the number of which is expected to be small, because the mislabeling error only happens when a combination of enterprise software and consumer test software are used together. Users of Symantec's consumer security products were not affected by the issue, which was in any case limited to Windows AntiSpyware beta 1 and not its later Windows Defender beta 2 product.