Why don't I have access to my Google Calendar tasks using either Lighting for Thunderbird or Evolution?
I can sync calendars without any problems, but I do not even have read access to tasks...
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The reason is because Google has not created any functionality in their Google Calendar APIs for doing anything with tasks. Without an API for this, applications would have to screen-scrape, which is a pain and is inconvenient.
Many developers want such an API, so such functionality will probably be added soon.
Until then, there's not much you can do. Sorry!