Hi- I'm hoping someone can help. I use Zimbra at work (sorry.. I'm not really sure how to check the version).. and Thunderbird 9.0 with Lightening (also not sure if there is a specific version of Lightening). I tried to use the Task functionality in Lightening... which I *really really* want to use... but have been getting so frustrated because for some reason I sometimes cannot delete a task. I've seen messages about this but not clear if/how to resolve. Does anyone have any advice? Appreciate any assistance.

Thanks so much!