David, thanks for the reply, I appreciate it.
When I had paid for Postbox I just, mistakenly so, assumed that Lightning would work with no problems. I was wrong.
I made the changes to the manifest and it didn't do anything so it seems that I might be out of luck.
I really wish I could find a good Gmail client with calendar built in. Or even if I could get links to work out of Postbox to open up iCal or such that would be great.
Oh well..
Thanks
Josh