What Free Tools Would You Use

Not a cyber security pro but tasked at first level to solve problems. Our IT company we pay is slow to react to requests and problems. We have a small network with 15 employees on one server running Microsoft SBS I think2016. From time to time users come to me and say something like I keep clicking on this email attachment, but it won't open. Can you open it? Our email is Office 365. Other than changing passwords for these …

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