Resources

Practical mailbox health guidance for Microsoft 365 admins.

Articles, checklists and explainers for understanding storage pressure, archive health and mailbox growth—so IT teams and MSPs can turn Microsoft 365 evidence into confident decisions.

Mailbox storageArchive planningAttachment growthCustomer reporting

Featured resource

Start with a structured mailbox review.

Checklist · Available now

Microsoft 365 Mailbox Bloat Checklist

Review the evidence behind mailbox growth before changing archive, retention or storage policies. This practical checklist helps admins identify pressure points, test assumptions and prepare a clear decision report.

Read the checklist

Use it to review

Largest and fastest-growing mailboxes
Archive usage and retention assumptions
Attachment-heavy storage patterns
Evidence required for the next decision

Available resources

Practical guidance you can use now.

Focused guides and checklists for reviewing mailbox evidence and preparing well-supported Microsoft 365 decisions.

Guide · 6 min

How to spot mailbox storage pressure before it becomes urgent

Use size concentration, item counts and growth signals to find where closer review is valuable.

Read guide →Planning · 7 min

Archive and retention questions to ask before changing Microsoft 365 policies

Frame the requirement, affected mailboxes, user impact and evidence needed before a policy decision.

Read guide →Checklist · 6 min

Shared mailbox review checklist for former users and role-based mailboxes

Review ownership, purpose, access, forwarding, activity and storage with a consistent process.

Read checklist →

Resource themes

Guidance for the decisions around mailbox health.

MailboxVitals resources focus on the practical questions teams face before planning archive, retention, licensing, clean-up or migration work.

Mailbox storage pressure

Spot mailbox storage pressure early

Recognise size, concentration and growth signals before capacity becomes an operational concern.

Archive and retention planning

Prepare for archive and retention reviews

Build the evidence needed to review existing policies against storage patterns and business requirements.

Attachment growth

Understand attachment growth

See how repeated large files contribute to mailbox and archive storage demand across a tenant.

Shared mailbox review

Review shared and role-based mailboxes

Assess ownership, purpose and storage signals for mailboxes that can otherwise remain overlooked.

MSP customer reporting

Create evidence for stakeholder conversations

Present mailbox health findings in a format customers and decision-makers can understand.

Safe change planning

Turn mailbox data into safer decisions

Use read-only assessment evidence to prioritise admin-controlled next steps with greater confidence.

Additional practical guidance across these themes is in development.

Your tenant, your evidence

Want to see your own mailbox health signals?

Request a free, read-only snapshot for a focused view of mailbox health, archive usage and priority storage signals.

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