Summary
A new Exchange Online admin policy will let admins set a tenant-wide default for using commas as recipient separators in Outlook mail compose and reply. Rollout starts in April 2026. Users can override unless locked by policy. No automatic changes; no action required.
Introduction
We’re adding a new Exchange Online admin policy that gives admins more control over the default Mail Compose and Reply setting that determines whether commas are used as recipient separators.
When will this happen
- General availability (Worldwide): Rollout will begin in early April 2026 and will be completed by mid‑April 2026.
How this will affect your organization
Who is affected
- Exchange Online administrators
- All users composing or replying to email in Outlook where no per‑user override is configured
What will happen
- A new admin policy will be available to set the tenant‑wide default for “Use commas as recipient separators.”
- Admins can choose whether the default is on or off for all users.
- Users may still change this setting in their Outlook client unless an admin enforces a policy that locks it:
View image in new tab - This update is especially useful for organizations whose contacts commonly use “Last name, First name” formats.
- No changes will occur automatically—tenants will retain existing behavior unless an admin modifies the policy.
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