Change the Outlook 2007 default meeting duration- not working

[DianeG]

I've been trying to change the meeting/appointment duration to 60 minutes but
it hasn't worked, I'm still only getting 30 min slots. The daily view time
slots have been changed to 1 hour but double clicking or selecting new
meeting request or appointment still gives 1/2 hour slots. Have I missed out
a step?

thanks

Diane