Our IT department is preparing to move historical email data from an on-premises Exchange Server to Microsoft 365. The primary mailboxes are part of our migration plan, but the archive mailboxes need special attention because they contain years of correspondence, attachments, and records that employees may still need.
Before we Migrate Archive Mailbox to Office 365, I want to identify where each archive is stored and confirm whether the source data is in an on-premises archive mailbox, an existing cloud archive, or a PST file. The migration method can vary depending on the source, so understanding the current setup should help us avoid choosing an unsuitable process.
We also need to check the destination accounts, licensing, archive configuration, and retention policies. I would create a list of archive sizes and prioritize the mailboxes that require more time to transfer. After migration, checking folder contents, attachments, and access permissions should help confirm that the important data is available.
During my research, I came across SysInfo Exchange Server Backup Software. Its listed features include user mapping, date filtering, duplicate removal, skipping previously migrated data, and progress reports. These options could be useful when organizing multiple mailboxes, although I would verify compatibility with our Exchange version and confirm the supported archive migration workflow before using it.
For administrators looking to migrate exchange archive mailbox to Office 365, what verification process do you follow? Do you compare item counts, test sample messages, or use migration reports alongside manual checks? I would appreciate suggestions for identifying missing emails or attachments before the old server is decommissioned.

Read More: https://www.sysinfotools.com/blog/migrate-archive-mailbox-to-office365/