Differences Between Exchange Online and Exchange On-Premises

 

Differences Between Exchange Online and Exchange On-Premises

  1. Online Capability

Needless to say, Exchange Online takes advantage of online services and features that are unavailable to Exchange On-Premises. In addition to the machine learning services that automatically triage between different types of mail, Exchange Online boasts collaboration features such as Office 365 Groups, which are near impossible to deploy quickly on-premises.

For example, in comparison to the duration it takes to provision an Office 365 Group on Exchange Online, Exchange On-Premises would likely require several weeks’ worth of setup for users to enjoy features like team mailboxes.

  1. Economies of Scale

Exchange On-Premises struggles to replicate the sheer size and scale of Exchange Online’s mailbox. Though Exchange On-Premises takes advantage of mid-sized servers and JBOD disks within the Exchange Preferred Architecture, it requires a tremendous amount of scalability to achieve what Exchange Online permits, which is $4 for a 50GB mailbox.

Exchange On-Premises also requires components like load balancers, redundant data centers, and mailbox dispersion to lower risk. Though Exchange On-Premises can be as reliable as Exchange Online, the analysis between cost and risk can be a difficult balancing act—the fewer risk on-premises, the higher the cost per mailbox.

  1. Speed

Not only is Exchange Online impossible to compete against when considering the time it takes to provision user inboxes, but it also updates its firmware at a speed that simply cannot be rivaled by Exchange On-Premises. In comparison to Microsoft’s on-premises update release schedule being four times a year, Exchange Online is capable of servicing updates daily.

Exchange On-Premises introduces features via service packs and Cumulative Updates, which vary depending on the version of Exchange. Additionally, both service packs and Cumulative Updates may also mandate other dependencies, such as .NET, to be updated.

On the other hand, Exchange Online absorbs these dependencies and introduces features at groundbreaking speeds. What Exchange Online may achieve in a matter of minutes or hours, Exchange On-Premises may take months or years to perform a wholesale update for enterprise versions of Exchange.

  1. Operational Efficiency

With Exchange Online, admins are not required to check backups, monitor application logs, or even rebalance Database Availability Groups after patching the server farm. With Exchange On-Premises, admins are required to perform status checks on all of the aforementioned tasks, in addition to building and maintaining a reliable service. Exchange On-Premises also requires an operational staff, which is an extra weight that does not equate to more optimal performance.

  1. Flexibility

Though Exchange Online is generous in terms of how it provides mailboxes with up to 100GB of storage and unlimited archiving, it is far from flexible. Users can consume what is presented in the Exchange Online service description but are not capable of expanding their options outside of building the features on their own.

However, Exchange On-Premises provides the ultimate flexibility of deployment, especially since IT can provision them within their budgetary constraints. These may include a multi-tenant deployment for hosted Exchange, customizing Outlook Web Access (OWA), or even a requirement to run code within the transport stack. With Exchange On-Premises, the ability to customize and deploy features is limited only by the organization’s resources and budget.

Conclusion

While there are plenty of differences between Exchange Online and Exchange On-Premises, deciding whether to deploy on-premises or in the cloud should always be determined by the organization’s need for requirements or features.

Since it’s difficult for organizations to sign off against must-have features, the final arbiter of how to deploy organization-wide mailboxes tends to point back to if mandatory requirements are met.

    Location: Kanpur, Uttar Pradesh, India

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