EY brings more data into focus with Copilot for Microsoft 365
The EY Global Tax team built a proof of concept of the plugin on a developer tenant provided by Microsoft. To focus those efforts even more precisely, while addressing security, the EY Global Tax team previewed Microsoft Copilot for Microsoft 365 and developed a plugin to evaluate the ability to extend the capabilities of Copilot to fit the Tax organization’s specific, internal needs.
- Agent or tool
- Microsoft Copilot
- Topic
- Software Development
- Reported on
- Case study (Microsoft)
- Added
- 2026-11-11
Why it matters
Coding agents are moving from autocomplete to doing whole tasks: reading a codebase, making a plan and changing many files. This case is a concrete example of where that works in practice. It is one of 221 sightings filed under Software Development on Agent Sightings (number 81 by interest), and one of 39 involving Microsoft Copilot.
How you could try it
Here is a reusable prompt, written by us in our own words, that captures the task. Paste it into Microsoft Copilot or any similar agent and adjust the details to your situation.
I want a coding agent to plan first, work on a branch, and show me the diff before anything is merged. The tool in the source case was Microsoft Copilot.
Tip: Work on a fresh branch, ask for a plan before edits, and review the diff and test results before merging.
Source
Read the original first-hand account on Case study (Microsoft): https://www.microsoft.com/en/customers/story/1703157436656300547-ey_professiona…. Our summary is a paraphrase; details are in the source.
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