Jean-Simon Roy, it's really hard to tell the exact day in the moment.
The IE support is tracked under https://jira.atlassian.com/browse/BON-1953
You probably would be interested in subscribing to the issue as a watcher to know when the release is published.
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Not exacly. It depends on few things. Overall IE 7.0, 8.0 are officially supported but results of taking screenshots may be different. Below page is describing what is working and what is not on a specific brower and system.
There are also few notes at the bottom related to IE. Please read this carefully.
You can also check if you are not using inPrivete mode since this is disableing all extensions.
I hope that will help.
The documentation says that 7.0 8.0 and 9.0 are supported.
Also if you still use IE8 be aware that JIRA 6.2 is the last version that will support IE8