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Office 365 Readiness Assessment: Is Your Business Ready?

25-point interactive checklist covering infrastructure, data, users, security, and planning. Find out if your business is prepared for a smooth Microsoft 365 migration.

May 9, 2026 10 min read Free Interactive Tool

Before you migrate a single email to Microsoft 365, there is one question that determines whether your project succeeds or fails: Is your business actually ready? Most migration disasters — downtime, data loss, angry users, emails in spam — trace back to skipped preparation steps.

This interactive 25-point readiness assessment evaluates your infrastructure, data inventory, user preparedness, migration planning, and security posture. Complete it honestly, and you will know exactly what to fix before migration day.

Your Readiness Score

0%0/29 complete
Critical items: 0/16 completeNot ready — complete more items first
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Interactive Readiness Checklist

Infrastructure

0/8 checked

Data & Content

0/6 checked

Users & Training

0/4 checked

Migration Planning

0/7 checked

Security & Compliance

0/4 checked

What Your Score Means

0–49% — Not Ready

Major gaps exist. Migrating now carries high risk of downtime, data loss, or post-migration issues. Complete the critical infrastructure and data items first.

50–79% — Partially Ready

Core items are in place but some gaps remain. You can plan migration with these items flagged as risks. Address remaining critical items before go-live.

80–100% — Ready to Migrate

Your business is well-prepared. You have verified infrastructure, inventoried data, planned the timeline, and addressed security. Proceed with confidence.

Email Your Assessment Results

Get a PDF summary of your readiness score and remaining action items sent to your inbox.

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Top 5 Readiness Gaps We See (And How to Fix Them)

1

Domain ownership is unclear or expired

Critical

Log into your domain registrar and confirm the registration is active. Ensure you have admin access to update DNS records (MX, SPF, DKIM, DMARC). If someone else manages your domain, get delegated access before migration.

2

Total data volume is unknown

Critical

Export a report from your current email admin panel showing total mailbox sizes. Add 20% buffer for growth during migration. If total data exceeds 500GB, plan for a multi-day staged migration rather than a single cutover.

3

No backup exists before migration

Critical

Use a third-party backup tool (like Veeam, SkyKick, or CodeTwo) to create a full export of all mailboxes before day one. Alternatively, export PST files for each user as a fallback. Never migrate without a verified backup.

4

Users have not been told about the migration

High

Create a communication plan: announcement email 2 weeks before, reminder 1 week before, daily updates during migration, and a "all clear" email after cutover. Include training dates and a single point of contact for questions.

5

SPF/DKIM/DMARC records not documented

High

Use MXToolbox or Google Admin Toolbox to inspect your current DNS records. Screenshot or document every record. After migration, these must be updated to reflect Microsoft 365 endpoints or your emails will land in spam.

Frequently Asked Questions: Office 365 Readiness

QWhat is an Office 365 readiness assessment?
An Office 365 readiness assessment is a pre-migration evaluation that checks whether your business infrastructure, data, users, and security posture are prepared for a move to Microsoft 365. It covers domain ownership, DNS configuration, email data inventory, user training needs, and security requirements. Completing one before migration reduces the risk of downtime, data loss, and post-migration issues by 80%.
QHow do I know if my business is ready for Microsoft 365?
Your business is ready for Microsoft 365 when you have verified domain ownership, documented all email data and user accounts, confirmed adequate internet bandwidth, planned user training, and set up a migration timeline. Use our 25-point interactive checklist above to evaluate your readiness across infrastructure, data, users, planning, and security categories.
QWhat are the most common reasons Office 365 migrations fail?
The top failure reasons are: (1) Not verifying domain ownership before starting, (2) Underestimating total data volume causing timeouts, (3) Missing shared mailboxes and distribution lists, (4) No backup before migration, (5) Inadequate user communication causing panic on cutover day, and (6) Forgetting to update SPF/DKIM/DMARC records post-migration causing deliverability issues.
QHow much data can I migrate to Office 365?
Microsoft 365 supports individual mailboxes up to 100GB (50GB on some plans). For larger archives, you can use Microsoft 365 Archive or Exchange Online Plan 2 with unlimited archiving. Total tenant storage is pooled — Business plans include 1TB per user. We recommend inventorying your total data volume before migration to select the right plan and avoid storage overages.
QDo I need to backup my email before migrating to Microsoft 365?
Yes — absolutely. While Microsoft 365 includes basic retention, it is not a backup solution. A third-party backup (or full PST export) should be completed before any migration. This protects you if data corruption occurs during transfer, if items are missed, or if you need to roll back to the old system. We include backup verification in every migration project.
QHow long does an Office 365 readiness assessment take?
A thorough readiness assessment takes 2–4 hours for a small business (under 50 users) and 1–2 days for larger organizations. The interactive checklist above helps you complete the evaluation systematically. Once the assessment is done, the actual migration planning and execution timeline can be determined with confidence.

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