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PURVIEWVSINDEPENDENTCOLLECTION · A GUIDE FOR UK LAWYERS Microsoft Purview or Independent Forensic Collection? Choosing the Right Collection Route for a Microsoft 365 Matter: and Defending the Choice Afterwards COMPUTER FORENSICS LAB

§ ABOUT THE AUTHOR PREPARED BY COMPUTER FORENSICS LAB E-DISCOVERY TEAM INDEPENDENT / COURT-APPOINTED EXAM IN AT I ON CPR PART 35 EXPERT REPORT S FULL CHAIN-OF-CUSTODY DOCUMENTATION

§ CONTENTS In this guide 01 Executive summary 02 The problem in plain English: the fork every M365 matter reaches 03 What Purview does well: and where it bites 04 What independent collection adds: and what it costs 05 The decision framework: trust, structures, downstream 06 Hybrid patterns that dominate real practice 07 Defending the choice: the record that survives the CMC 08 Source architecture: where else the evidence lives 09 Worked examples 10 Common mistakes and technical limitations 11 Questions to ask · Suggested wording 12 Checklist and red flags · When to involve a digital forensic expert 13 Frequently asked questions 14 Glossary · References · Disclaimer · How a specialist laboratory can assist

§ 01 · ORIENTATION Executive summary THE HEADLINE POINT: PURVIEWFORSCOPE, INDEPENDENCEFORTRUST, HYBRIDSFOR MOSTREALMATTERS

§ 02 · FIRST PRINCIPLES The problem in plain English: the fork every M365 matter reaches

§ 03 · THEHOUSETOOLS What Purview does well: and where it bites