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how do I revert to version 3.6.13? 4.0 is causing many problems.

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Since updating to version 4.0 today my work email and my local isp email no longer work. How do I revert to 3.6.13?

Since updating to version 4.0 today my work email and my local isp email no longer work. How do I revert to 3.6.13?

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