"IBM Value institute projects that 98% of organizations realize that a hybrid and multi-cloud approach towards the cloud is most appropriate."

Moving on-premise email to Microsoft 365 should not be an all or none decision. Choose the right ‘hybrid’ configuration using hybrid cloud technologies

Many organizations using Microsoft Exchange are contemplating on moving their Email and messaging to the Microsoft 365 public cloud.

Now with Hosting Controller hybrid controller, you can manage your on-premise MS Exchange and the Microsoft 365 cloud together as a single mail organization. Within the same OU, you can choose which user accounts stay on-premise and which go to the cloud and for every user, which apps run on-premise and which apps go into the cloud.

Factors shaping your hybrid strategy

Factors shaping your hybrid strategy

Main decision factors for choosing hybrid:

  • Cost comparison of on-premise user accounts with cloud hosted.
  • Individual profile of the user and needs for special applications
  • Regulatory restrictions for storing data in specific places or ways
  • Existing integrations with other applications
  • Target applications use available only in the cloud
  • Risk mitigation of moving to the cloud (keep rollback readiness at all times)
  • Fear of the unknown. Keeping old on-premise infrastructure concurrently running along with the cloud for an indefinite time.

Next Steps Towards a Hybrid Cloud

Option 1: Stay On-Premise, Transform to a private cloud

Microsoft Exchange is not designed as a cloud hosted application. It requires continuous involvement of IT staff and most admis tasks are still done by executing powershell commands.

Many organizations plan to move to Microsoft 365 to get benefits of a cloud hosted service. Hosting Controller with Microsoft Exchange module enables organizations to transform their existing on-premise MS Exchange into a private cloud making their on-premise experience very similar to cloud hosted with Microsoft 365. They get:

  • Dashboards for mailbox users
  • Dashboards for IT Admin staff
  • APIs
  • Best security practices

Read More

Stay On-Premise, Transform to a private cloud

Permanent Hybrid Configurations

Option 2: Permanent Hybrid Configurations

A permanent hybrid configuration enables co-existence of on-premise Exchange with the Microsoft 365 public cloud.

Different configurations are possible.

  • Mailbox Partitioned Configuration
  • App-Partitioned Configuration

Individual user accounts can be moved from on-premise Exchange to the cloud (onboarding) or can be moved from cloud back to on-premise (offboarding) without any downtime.

Option 3: Phased Migration

Phased migration enables moving mailboxes from on-premise exchange to cloud one at a time. Since an typical mailbox is between 10GB to 100GB of data, the movement goes slow. Such a process enables an organization to move at its own pace choosing few mailboxes to migrate at a time all without any downtime.

Phased Migration

Cutoff Migration

Option 4: Cutoff Migration

A typical cut-off migration. All things are planned in advance and Migrate! button is pressed in the end. Because of enhanced configuration of MS Exchange, mailboxes continue to operate without any downtime while migration is taking place but in the end the source infrastructure is redundant and is scheduled to be retired. Hosting Controller Efflux Migrator product is designed for such migrations.

Benefits of Going with Hybrid Exchange

See how a hybrid Exchange deployment combines the best of both worlds for an IT admin.


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