Next Steps in Our Microsoft 365 Journey

Thank You-6

An Update from the Microsoft 365 Team at Cook Children’s:

We want to begin by thanking everyone for their patience and support as we completed the move from on-premises Exchange to Microsoft 365 Exchange Online and rolled out Cook Children’s Mobile Services. We know this transition wasn’t easy for everyone, and we sincerely appreciate your patience and cooperation as we navigated the complexities and timing adjustments that came with this effort.

These upgrades are an important step in modernizing our technology environment — improving performance, security, and reliability while giving all of us access to the latest tools that support how we work and care for patients.

With this milestone behind us, we’re moving forward with the next phase of our Microsoft 365 transformation:

What’s Next

Shared Mailboxes and Distribution Groups
Migration will begin Oct. 27. Given the large number of mailboxes and groups, we anticipate this work will continue through early February 2026.
Check the M365 site here for status updates and progress reports.

Microsoft 365 Desktop Applications
Beginning Nov. 5 through Jan. 15, we’ll start replacing Microsoft Office 2016 with the new Microsoft 365 desktop apps.
Learn more about what to expect on the M365 site.

Windows 11 Upgrade
Starting March 2026, we’ll begin upgrading to Windows 11 system wide.
More details will be shared on the M365 site as the date approaches.

Your engagement and feedback have been invaluable in getting us here. Thank you again for helping us make this transition a success as we continue building a more modern, secure, and connected environment for Cook Children’s.

With appreciation,
The M365 Team