Implemented OAuth support for Exchange Online and upgraded target framework to .net 4.8#135

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Commits on Jun 3, 2024

Updated Target Framework from 4.5 to 4.8.0
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Commits on Jun 5, 2024

Added OAuth support for Office365 Exchange Online;
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Client Secret string for the Exchange application is now stored in an encrypted file rather than plaintext in the config, must be generated with DPAPI;
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