Meeting request in Thunderbird

I will receive meeting.ics (VCS/ICS calendar attachment) from my manager , previously I had some add-on in Thunderbird which was working fine . After some updates the meetings.ics file become as attachment , its not automatically added to calender?

What is the issue ? How can this be resolved?

Edit 2 : I have the Lightning Project, an extension also

Solution 1:

It would be helpful if you could add a bit more information - what version of Thunderbird are you using? What version of Lightning are you using? What was the update (or updates) that caused the problem? What addon(s) are you using apart from Lightning?

Using Thunderbird 2.0 and Lightning 0.9 this works for me. You could backup your profile, uninstall the Lightning addon, uninstall Thunderbird, then reinstall Thunderbird 2.0 and the Lightning 0.9 addon.

Solution 2:

This is a known problem with the Thunderbird/Lightning combination. There is a small workaround though found here:

You need to set "display attachments inline", then you can accept or decline invites though a button at the top of the email-preview. You can also drag the ics-attachment to the calendar-button in the mode-toolbar. Lightning doesn't register itself as the default program for .ics files (yet).

Solution 3:

Could it be that something has changed on your manager's side? I believe this option needs to be selected in Outlook 2003:

Tools > Options > Calendar Options... > When sending meeting requests over the Internet, use iCalendar format

Solution 4:

I don't use lightening (unless it installed automatically with thunderbird 3) but I use outlook, and i find that Thunderbird thinks .ics files are text files and cannot handle them properly. If I tell it to open with outlook it opens an email with the file attached to send. The only work around I have found is to save the attachment (I do it to desktop) then open it, and windows knows what to do with it.

why cant the programmers either let windows handle attachments like it used to in the old versions, or allow the user to add file types so that it knows .ics is an outlook calendar file (in my case)?.