Cloud vs. On-Prem for Mail Systems.
The biggest difference between MS Exchange Server and Office 365 (Microsoft 365) is the centralization of data and who it is managed by. Utilizing a cloud service such as Office 365 (Microsoft 365), all of your data and services are being managed by Microsoft. MS Exchange Server is hosted in house with physical hardware, meaning that data can be managed locally, and services will always be available on the local area network (LAN). Every situation is unique and dependent on future business goals and function.
Microsoft 365: (Cloud) Pros:
Cost Effective... Licensing is based on the amount of users which includes all premium MS Office applications such as Word, Outlook, Excel, and PowerPoint
Reduced Resources... Utilizing a cloud based system removes need of physical hardware
Ease of Maintenance... Microsoft servers are maintained by Microsoft saving troubleshooting and maintenance time
Access to Documents and Email 24/7... MS stores all of your documents in their repositories which can be access from any computer, at any time
Data Security... Relying on a cloud service to house your data poses a security threat to your business. Microsoft employs security threat protection, but without the ability to physically control the services, you can not employ your own security features.
Limited Features... Utilizing the online version of MS Office apps have limitations