Comment 9 for bug 237341

As discussed on the l10n newsgroup, the "Last Week" sorting group label in the message list is misleading. It doesn't mean the last calendar week but the last seven days.
http://groups.google.com/group/mozilla.dev.l10n/browse_thread/thread/c597551173c2703

The label could be changed to "Last seven days", or the grouping could be made on calendar weeks instead. John Wilcock proposed to split that in "Earlier this week" and "Last week" based on calendar weeks.