If your EWS applications stopped working and you are looking for a quick relief, please see Exchange Online EWS application stopped working? Do this. | Microsoft Community Hub. Re-enabling EWS is pos...
Updated Oct 27, 2026
Version 21.0
Blog Post
One unresolved migration gap: access to the master category list of Microsoft 365 Group mailboxes. We have no confirmed Graph replacement for our EWS implementation.
- Graph has /users/{id}/outlook/masterCategories for user mailboxes, with application permissions.
- There is no documented Group equivalent. Our current route is EWS GetUserConfiguration ("CategoryList") on the Group mailbox.
- Microsoft Support tested the preview userConfiguration Graph API for us: it works on a user mailbox and fails on a Group mailbox.
- Our design change request (DCR 720928901, Microsoft Support case 2609230040001732) was closed on 3 November as not planned.
After EWS retirement, applications using this route need another way to retrieve the Group master category list, including its colours. This is one settings object per Group mailbox, not generic Group mailbox CRUD. Graph already serves this exact list for user mailboxes — why are Group mailboxes left out? And if it will not come to Graph, what supported migration path does the Exchange team recommend?
Feature request: https://feedbackportal.microsoft.com/feedback/idea/9bc115fa-51d8-f111-bda1-7c1e52baf49b