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When Thunderbird is receiving emails I see a very high CPU usage from Windows Defender, to a point that it hangs and become unresponsive. If I turn off real time protection, it go back to normal. Also, every time I open Thunderbird, it receives all emails over again. How can I fix this? I'm on Windows 1709 (16299.431) and Thunderbird 52.7.0

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Add Thunderbird profile directory to exceptions in Defender.

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