How to Fix Mimecast Contacts Export Tool – fail to authenticate

Cloud Based Security, Office365

This post is to fix the Mimecast Contacts Export Tool “fail to authenticate” error. Environment Microsoft Office365 with Exchange Online Only (there is no on-premise Exchange) Mimecast Contacts Export tool is used to gather all the permit sender email address list “Fail to authenticate” error pops out while logging into the Mimecast Contact Export tool […]

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