Trend Micro ScanMail for Exchange (SMEX) before 3.81 and before 6.1 might install a back door account in smg_Smxcfg30.exe, which allows remote attackers to gain access to the web management interface via the vcc parameter, possibly "3560121183d3".
https://exchange.xforce.ibmcloud.com/vulnerabilities/11061
http://secunia.com/advisories/7881
http://kb.trendmicro.com/solutions/solutionDetail.asp?solutionId=13352
http://archives.neohapsis.com/archives/vulnwatch/2003-q1/0021.html