Re: Cannot get McAfee Security for Microsoft Exchange 8.5 to deploy on a Windows Exchange 2010 Server
Not really true - it can be deployed.
The reason for failure would be in the msi log created in the system temp. Reason may also appear in Event Log as MSI install failure - you may get exact error message there.
MSME install will check for compatibility in local systems such as is there an earlier version of MSME installed if so it must meet upgrade requirments as per the guide. (It will stop if it meets an older MSME such as 7.6 with no patches/hfs)
Install also checks compatibility with the installed Roles for E2010 - it looks at reg keys for the Roles in HKLM\Software\Microsoft\ExchangeServer - if a mailbox/hub/edge role not defined or defined incorrectly the install can fail.
If logging and events not available you could test a manual install and get the exact error that would appear on screen - then also the msi log will be in the temp of the user running the install (start run or Winkey+R - %temp%)