A known issue is affecting users ability to export calendar events in IE and SSL
A number of users have reported that they are unable to export calendar events in IE once their community has SSL enabled. This only affects users that are using IE as their browser.
After having our development team investigate the issue to see what we can do on our end our development team has reached a dead end. Unfortunately there is nothing we can do to correct this issue on our side that wouldn't seriously compromise the platform or security.
For users running IE9 the good news is that there is a hot fix available from Microsoft to correct this issue, please see the following Microsoft Knowledge base article for more information:
Thank you for your understanding.