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Microsoft 365
Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line.
4,723 questions
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If you are using Exchange Online, ZIP files are not blocked by default, so someone on your end made a deliberate decision to block them. The block itself can be done either via Transport rules (check the Exchange Admin center) or via the anti-malware policy. Check this article for more details.