Hello Jeff,

Yes, we do recommend using Google chrome to access our web app. We are however working on a mac app that will hopefully launch soon that will allow you to access and use our app on your macbook.

Thanks so much for your patience, J Microsoft To-Do Support

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September 25, 2018, 21:47 Thank you for contacting Microsoft To-Do Support. We received your message and will get back to you as soon as possible.

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September 25, 2018, 21:47 I attempt to login using latest FF on my MacBook Pro, and I get the "too many auth. attempts" error message on the first try. Then again, it worked fine this morning. Go figure.