Versions

20.4.0.40	25.00%
20.3.1.22	12.50%
20.3.0.36	12.50%
20.2.0.19	12.50%
19.9.0.9	25.00%
18.7.2.3	12.50%

msouplug.dll has 6 known versions, the most recent one is 20.4.0.40. The average file size is about 400.96 KB. It is an authenticode code-signed executable issued to Symantec Corporation by the certification authority VeriSign. Some variations of the file have been seen to be installed with the program Norton Internet Security from Symantec Corporation.

AntiSpam MS Outlook Plugin is part of Norton Internet Security, a PC program that provides malware prevention and removal during subscription period and uses signatures and heuristics to identify viruses, trojans and other malware. Norton Internet Security features include a email spam filtering, personal firewall, and phishing protection.