User Agent: Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20100101 Firefox/15.0 Firefox/15.0
Build ID: 20120824154833
Steps to reproduce:
Go to “File”, “Print”, “Layout => monthly grid”
the paper orientation is the same that the one used for every other Thunderbird task (ie portrait by default)
Lightning should automatically switch the paper to landscape instead of portrait. I have never seen a monthly calendar print on a portrait page!