This eBook explains why organizations considering a move from Microsoft 365 E3 to E5, or already on E5 but not fully using it, can unlock stronger security outcomes by pairing the expanded Microsoft 365 Defender toolset with expert services to overcome deployment complexity, skills gaps, and alert overload. It highlights E5’s added capabilities, including advanced threat protection and broader Defender coverage across endpoint, email, identity, and cloud apps, and argues that tool consolidation can reduce silos and improve cross-domain detection (pages 3 and 7). It positions Critical Start’s Microsoft-focused workshops, assessments (Defender and Sentinel), and managed XDR/MDR as the operating model to tune configurations, cut false positives, monitor and resolve alerts 24x7x365 with SLAs,

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