Review for LookOut by tappara
Rated 4 out of 5 stars
It works, but it doesn't open automatically calendar .ics info when there are more than one contents in winmail.dat, even if the "Open calendaring data directly" option is checked.
I often receive Outlook mails with appointment (.ics) + rtf description: Lookout doesn't prompt to add to calendar the event.
The only (annoying) workaround is to save the .ics file and import it manually.
To create your own collections, you must have a Mozilla Add-ons account.