The problem we are experiencing at work is the Exchange server generates the text/html and text/plain alternates for calendar event invitations and these alternatives are blank!
Since Thunderbird without Lightning will ignore text/calendar, it correctly displays this blank html message.
So i recommend that if Thunderbird sees text/calendar that at least it tells the user there is a preferred format. This gives the user the option of installing extensions. This could probably be added generically for any type of file.
The problem we are experiencing at work is the Exchange server generates the text/html and text/plain alternates for calendar event invitations and these alternatives are blank!
"<html> < /div>
...<meta name="Generator" content="Microsoft Exchange Server">
...<div>
...</html>"
Since Thunderbird without Lightning will ignore text/calendar, it correctly displays this blank html message.
So i recommend that if Thunderbird sees text/calendar that at least it tells the user there is a preferred format. This gives the user the option of installing extensions. This could probably be added generically for any type of file.