Zero credit and Work unit states "Didn't need" what does this mean?

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BOINCing since October 1999

"Didnx27t need" means the server cancelled those work units before your computer started them. This happens when an experiment collects enough data from the network and is retired — any remaining queued tasks get cancelled since the results are no longer needed. This is handled automatically by our system, which runs periodic cycles to retire completed experiments and clean up remaining tasks.

Your computer never spent any time on those tasks, so no credit is awarded for them. If your computer had already started working on a task before it was retired, you still get full credit for that work — we never take back credit for time your machine actually spent computing. Only tasks that were cancelled before they started running show zero credit.

Looking at your account, you have 80 successfully completed tasks with full credit. The 49 cancelled ones were all zero elapsed time — they were in your queue but never ran.

This is normal operation. New experiments will continue to be sent to replace the retired ones.

Thanks that a better explanation then what I found in the FAQ
thanks again

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BOINCing since October 1999