Microsoft Defender for Office 365 - 2025 Pricing, Features, Reviews & Alternatives

Reviewers appreciate Microsoft Defender for Office 365's spam blocker feature. They find it effective in automatically filtering and blocking unwanted emails, which helps save time and keep inboxes clean. Users report that it prevents malicious attacks and unwanted messages from reaching their systems. They say it integrates well with Exchange Online Protection and note the convenience of not needing additional software. Reviewers indicate it helps protect their data and communications, ensuring a secure email environment. Of the 26 Microsoft Defender for Office 365 users who gave detailed accounts of their use of Spam Blocker, 96% rated this feature as important or highly important.

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“The spam blocker is great and it automatically protects us from spam by Exchange Online Protection and also other harmful mails.”

Abrar Khan

Survey Programmer

“It works very good, almost no spam received anymore after we activated Defender for Office 365 P1 ”

BH

Bart Hendrix

Sr Accountmanager

Users report that Microsoft Defender for Office 365's spam detection feature is highly accurate and helpful in identifying and managing spam. They appreciate the real-time protection against viruses and malware in emails. Reviewers indicate the system's ability to filter spam based on sender and receiver criteria, and the option to adjust filtering mechanisms. They find it keeps their inboxes free of unwanted emails and note that it works well to catch spam, although some feel there is room for improvement. Of the 20 Microsoft Defender for Office 365 users who gave detailed accounts of their use of Spam Detection, 90% rated this feature as important or highly important.

Reviewers highlight the effectiveness of Microsoft Defender for Office 365's phishing protection feature. They find it reliable in detecting phishing websites and dangerous apps, providing warnings to prevent data loss. Users report that it protects against malware threats during email transmission and secures personal information. They appreciate the ease of setting up DKIM, SPF, and DMARC to stop domain spoofing. Some reviewers feel the phishing protection could be improved to let fewer threats through. Of the 19 Microsoft Defender for Office 365 users who gave detailed accounts of their use of Phishing Protection, 89% rated this feature as important or highly important.

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“This system is so reliable because it protects users from any malware threats during the email's journey from the sender to the recipient to avoid automatic sending of user information.”

Donatien Banyishayi

Full Stack Developer

Highly relevant

“Phishing protection needs to improve to let less through.”

IB

Ian Banigan

Prevent Manager