[ubuntu] Received calendar invite: What's the most professional way to respond?

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http://ubuntuforums.org – I just received the first calendar invite I've ever gotten once I moved to Ubuntu. I need to 'look' professional. In the olden days (years ago, on Windoze), I'd simply accept with Outlook; but ... I'm not using Outlook. I'm using Thunderbird for email and nothing for a calendar manager. To 'professionally' handle a calendar invite, what software on Ubuntu is recommended? Code: BEGIN:VCALENDAR X-LOTUS-CHARSET:UTF-8 VERSION:2.0 PRODID:-//Lotus Development Corporation//NONSGML Notes 8.5.2//EN_S METHOD:REQUEST BEGIN:VTIMEZONE TZID:Pacific BEGIN:STANDARD DTSTART:19501105T020000 TZOFFSETFROM (Hardware)