We helped a large multi-billion-pound construction firm move from a hosted exchange system to Office 365. The company wanted to migrate all users both active and inactive to a centralised location, merging multiple domains from companies they have acquired to a single domain name space.
They were running Microsoft Exchange 2007/2010 across multiple sites.
Summary
All of the mailboxes now use Office 365 and Exchange Online. No one has lost any messages, and everything has transitioned across with no issues.
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