Hosted Exchange Online plans
We have now merged our dedicated Exchange hosting offerings with Microsoft Office 365 individual services such as business class email with two offerings – Exchange Online plan 1 and Exchange Online Plan 2. We can assist you with 100% seamless migration of your On-Premise Exchange Server to Office 365 platform with no disruption in service;
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https://products.office.com/en-us/exchange/compare-microsoft-exchange-online-plans