The warning is here: https://www.toodledo.com/connect_outlook.php
Not to say they don't happen, but I have not personally heard too much about deletions. I have seen a number of reports about duplications. I don'tg think much has changed since that warning was put up, but there is a new beta of the sync tool that is currently being tested, and it seems to have a number of changes, so maybe it also improved stability. You can find out about if you look in the Third Party Applications forum.
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