Creating recurrnig tasks using WEBDAV   

Hi,
Can anyone please let me know how I can create recurring tasks, ie setting 
Recurring Range and Patterns using WebDav. I was able to do this for 
appointments using rrule property, but the same is not working for Tasks. 
I tried suing MAPI but could not figure out exactly which property/tag to use.
Please help
Thanks,
Naresh

date: Mon, 31 Oct 2005 03:56:03 -0800   author:   Naresh Mirkhelkar Naresh