Patch 15 was primarily released to resolve high-risk vulnerabilities that affected previous versions (prior to P15):
If you meant something else (e.g., a technical review, historical notes, or a patch summary), please provide the missing part of your request. McAfee VirusScan Enterprise v8.8 P15 Patched - ...
: Native support for Microsoft Office 2010 applications, including direct email and attachment scanning for Outlook. Patch 15 was primarily released to resolve high-risk
For those interested in the technical weaknesses of VSE 8.8, these research pieces detail how the software was bypassed or exploited before its retirement: Security Restrictions Bypass (Exploit-DB) a technical review