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Email Investigation& eDiscovery Services
When email evidence matters, process and discretion matter just as much as technical capability.
Hamilton365 provides confidential email investigation services for legal professionals, HR teams, and organisations that need to locate, preserve, and present email evidence from Microsoft 365 or Exchange environments.
Strict confidentiality and chain-of-custody principles applied to every engagement.
Our Experience
Hamilton365's principal specialist has spent 25+ years in enterprise IT, including a decade managing Identity and messaging infrastructure for 200,000+ users, and has conducted sensitive investigations across large Microsoft 365 environments involving regulatory compliance, workplace conduct, and legally sensitive subject matter. That background brings both the technical capability and the professional discretion these engagements require.
This is also a daily discipline, not an occasional one: in that enterprise environment, legal hold and audit settings are enforced through automated lifecycle governance across thousands of mailboxes, with time-boxed access and periodic access reviews. When your matter depends on data being preserved correctly and access being defensible, that is the standard your engagement inherits.
What This Service Covers
Email Search & Retrieval
Email search and retrieval from Microsoft 365 / Exchange Online using eDiscovery tools
Purview Content Search
Microsoft Purview Content Search and eDiscovery case management
Legal Hold
Legal hold configuration to preserve evidence and prevent deletion
Evidence Export
Export of email evidence in court-admissible formats (PST, EML)
Advanced Search
Keyword and date-range search across mailboxes, Teams, and SharePoint
Chain of Custody
Chain of custody documentation and plain-language findings summary
Who This Service Is For
Solicitors & Law Firms
Email evidence for litigation, with proper chain of custody and court-admissible export formats
HR Managers
Workplace investigation support with confidentiality and regulatory compliance
Business Owners
Investigation of suspected fraud, theft, or misconduct with professional discretion
Organisations Facing Regulatory Inquiry
Email preservation and evidence production for compliance and regulatory requirements
Confidentiality & Process
Strict Confidentiality
All engagements are conducted under strict confidentiality
Chain of Custody
Evidence handling follows established chain of custody principles
Professional Standards
25+ years of experience with professional discretion and expertise
Clear Documentation
Plain-language findings summary suitable for legal or HR use
The decision that has to be made before an investigation is possible
The most common reason a mailbox cannot be examined is that nobody preserved it. A hold has to be applied, and confirmed as applied, before the departing employee account is deleted. After that the window is thirty days, and then the option is gone entirely. If somebody is leaving and there is any prospect of a dispute, that decision is being made right now whether or not anybody is making it deliberately.
Microsoft 365 offboarding, and what to preserve before anything is deletedIf an invoice has just been paid to the wrong account
The investigation is the second call, not the first. There is an ordered response for a business email compromise that has already cost somebody money: the bank, the mailbox, what to preserve before anybody tidies up, and who has to be told and by when.
Business email compromise, what to do now and in orderIf an email has simply been deleted and you want it back, most of the time that is a four-minute job you can do yourself. Recovering deleted email in Microsoft 365 has the steps and the retention windows, and nothing on it is behind a form. Come back here if what matters is proving what was deleted rather than reading it again.
If the search is to answer a privacy access request rather than an investigation, and your practice is an AML/CTF reporting entity, the AML/CTF privacy readiness page covers the retention and Content Search side of that obligation.