Hi @fahmy, Since Microsoft are moving away from legacy authentication methods and Basic authentication will be deprecated, customers have to upgrade their Authentication method to OAuth2.In the Microsoft documentation following is mentioned regarding the basic authentication disabling date. The basic authentication disabling is already in place since October 1, 2022 and only for Office 365 Operated by 21Vianet the disabling is happening on March 31, 2023. --------------From MS Docuement ----------------------In Office 365 Operated by 21Vianet, we'll begin disabling Basic authentication on March 31, 2023. All other cloud environments are subject to the October 1, 2022 date.-----------------------------------------------------------------------Please refer to https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online#pop-imap-and-smtp-auth As a solution for this situation IFS has released a patch (165088, 165523) f
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