Firefox doesn't pass vCalendar downloads to Outlook correctly.
Setup Firefox to associate .vcs files with Outlook (not save to file,) and download a calendar entry from a web site such as United.com. When you confirm the download, Outlook will start and display an "Invalid command line entered, please check your switches" error message.
Saving the vcs to a file and then using Windows to associate it with Outlook doesn't have this problem, and IE doesn't have this problem.
Setup Firefox to associate .vcs files with Outlook (not save to file,) and download a calendar entry from a web site such as United.com. When you confirm the download, Outlook will start and display an "Invalid command line entered, please check your switches" error message.
Saving the vcs to a file and then using Windows to associate it with Outlook doesn't have this problem, and IE doesn't have this problem.