Exchange & Outlook
Email, calendars, mail flow, and Outlook clients. 21 guides in this topic.
- BIMI and brand indicators in emailBIMI shows your brand logo next to email from your domain in supported clients. Here's the setup and the prerequisites.
- Distribution lists vs Microsoft 365 GroupsHow DLs, mail-enabled security groups, and Microsoft 365 Groups differ — and when to use each.
- DMARC rollout from p=none to p=rejectHow to roll out DMARC enforcement progressively — the journey from monitoring to enforced anti-spoofing.
- Exchange hybrid deploymentHow hybrid Exchange works — connecting on-prem Exchange Server with Exchange Online, what the wizard actually does, and the path off the last server.
- Exchange Online anti-spam and anti-phishingThe layered defences Exchange Online uses against spam, malware, and phishing — and how to tune them.
- Exchange Online archiving and litigation holdHow Exchange Online keeps mail beyond the primary mailbox — archive mailboxes, retention, and legal hold.
- Exchange Online mail flow and connectorsHow mail moves into and out of Exchange Online — connectors, transport rules, and hybrid routing.
- Exchange Online resource mailboxesHow room and equipment mailboxes work — provisioning, booking, and admin pitfalls.
- Exchange transport rule examplesReal-world transport rule patterns — external-sender warnings, encryption triggers, blocking, and compliance scenarios.
- Managing Outlook signatures at scaleHow to manage email signatures in Outlook — cloud signatures, transport rules, and third-party tools.
- New Outlook vs classic Outlook on WindowsMicrosoft is replacing the classic Outlook for Windows with a web-based "new Outlook." What actually changes, what still doesn't work, and how to run the migration without a revolt.
- Office 365 Message EncryptionOME is Microsoft's email encryption service — what it does, how to enable it, and what it looks like for recipients.
- Office 365 Message Encryption deep diveHow OME works under the hood — encryption flow, branding, custom templates, and the recipient experience.
- Outlook cached mode and OST filesHow classic Outlook caches mailbox data locally — what an OST file is, when to use cached mode, and the modern alternatives.
- Outlook calendar delegationThe three ways to share a calendar in Outlook — delegate access, share permissions, and shared calendars.
- Outlook Focused Inbox and the legacy Clutter folderHow Focused Inbox separates important mail from the rest, and what happened to its predecessor Clutter.
- Outlook mobile policies and app protectionHow to govern Outlook mobile on iOS and Android — app protection policies, security settings, and feature controls.
- Outlook rules and automationClient-side rules, server-side rules, and Power Automate — the three ways to automate email handling in Microsoft 365.
- Proxy addresses and email aliases in Exchange OnlineHow Exchange Online decides which addresses a mailbox answers to — proxy addresses, the primary SMTP address, UPN vs email confusion, sending from aliases, and the hybrid gotchas.
- Shared mailboxes explainedShared mailboxes are mailboxes multiple people can monitor. Here's how they differ from groups, distribution lists, and personal mailboxes.
- What is Exchange Online?Exchange Online is Microsoft 365's cloud email and calendaring service — what it does, how it fits with the wider platform, the security and compliance layers on top, and the operational realities of running it well.
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