In kronolith/lib/Kronolith.php 
horde-webmail-1.2.2/kronolith/lib/Kronolith.php line 1059 I simply 
added changed the string to be:



To accept the event: (this will not update your calendar for you!)



This is clearer language, though it still may not be entirely desirable:



To tell the event organizer you will be attending:

To tell the event organizer you may be able to attend:

To decline the event:

Cool - would you be willing to post your modified language, if you 
think it'd make a good default?

We have changed the language of the email on our install to tell users 
it will not automatically add the event to their calendars, and to use 
the .ics file that's attached to the invite.

I think the most common use case is that the people receiving these 
messages won't be on the same Horde install.



What about making the language more clear that you're just replying, 
and providing a link to a .ics file for the event if you want to add 
it to your calendar?

For clients email that do not support iTip, email invitations to 
attendees of an event include links to accept, tentatively accept, and 
decline an invite.  Upon user testing, my users who relied on the 
Kronolith web calendar but used their own email clients expected the 
accept link to add the event to their calendar.



The solution, as I see it, is to ask (or present a prompt) to the user 
upon clicking the Accept link if they'd like it to be added to their 
Horde calendar.  If the user is not logged in, they should be directed 
to the login page, or given a quick login dialogue on the accept page. 
(a redirect should not happen automatically, as I think it's a safe 
assumption there is a use case out there for sending an invite to a 
user who does not have a login to the Horde installation)