I want to send booking information through mail in an attachment to add in MS Outlook. Which format is better? Especially for MS Outlook 2003?
iCalendar was based on a vCalendar and Outlook 2007 handles both formats well so it doesn't really matters which one you choose.
I'm not sure if this stands for Outlook 2003. I guess you should give it a try.
Outlook's default calendar format is iCalendar (*.ics)
*.ics