Microsoft Office 365 Migration Overview

1) IMAP Migration

• Domain and User Setup
• Redirect Mail Flow (MX Record)
• Start Incremental Sync (once per 24 hours)
• Select New MAPI profile
• Outlook Download

2) Cutover Migration

• Domain Setup existing service is prepared
• Initial Email Sync (5-10Gb/hr)
• Incremental Sync (once per 24 hours)
• New MAPI Profile (Friday evening)
• Outlook Download
• Redirect Mail Flow (MX record)
• Incremental Sync
• Delete Migration Batch (Monday)

3) Staged Migration

• Domain and Directory Sync Setup
• Batch #1 Start (Evening)
• Incoming Emails Delivered to Both mailboxes
• Initial Sync (5-10Gb/h)
• New MAPI Profiles
• Outlook Download (night)
• Incremental Sync (once per 24 hours)
• Batch #1 Delete
• Next Batch
• Repeat until complete
• Redirect Mail Flow (MX Record)