Mac OS 13.4 Microsoft Defender won't open

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Mac OS 13.4 Microsoft Defender won't open

2017 Macbook Pro, Mac OS 13.4.1

Microsoft Defender installed by my Office 365 subscription, without my asking it, along with a VPN. I have used it before the latest OS update. Now it won't open, and Microsoft can't tell me why. Perhaps you can.

Cheers, John

MacBook Pro 13″, macOS 13.4

Posted on Jul 25, 2023 3:48 PM

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Answer 1

a brody

Level 10

85,366 points

Jul 25, 2023 5:18 PM in response to John Nightingale

Try updating to through Apple menu -> About This Mac -> Software Update. Mac OS 13.5 was just released yesterday.

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Mac OS 13.4 Microsoft Defender won't open

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