Just a FYI that Cisco released 7.5.2 of the Outlook Plugin software and if you have the default install done all of your end users will get a pop up telling them that a new version is available.
The Download link just takes them to a Cisco software download page, the user needs to login with a Cisco ID, have a contract number to download the software.
Two complaints:
What's new in this Version isn't used for what's new in this version, just talks about the same link the 'Download' button has.
Most end users are not going to have a Cisco ID or a contract number to download the software.
Resolution:
Looks like this can be controlled with the C:\ProgramData\Cisco\Cisco IronPort Email Security Plug-In\username\CommonCompnentsConfig.xml file and setting
<checkForUpdates>
<checkAutomatically display="hidden">true</checkAutomatically>
<ignoredVersion>7.5.2</ignoredVersion>
<serverURL>http://updates.res.cisco.com</serverURL>
</checkForUpdates>
checkAutomatically to a false value.