MC1492155 - Microsoft PowerPoint for Mac: Smarter Keep Source Formatting slide pasting experience

Microsoft 365 Message Center announcement MC1492155.

MS Message Center's Summary

Microsoft PowerPoint for Mac is updating the Keep Source Formatting paste experience to import only required slide masters and layouts. This change reduces presentation file sizes and improves collaboration performance. Rollout runs from late September to late October 2026. Administrators should inform users about the improved paste efficiency and the available setting to revert to the previous behaviour if needed.

Administrator impact
No direct administrator action is required.
End user impact
Users pasting slides with Keep Source Formatting will experience smaller file sizes and better performance, with an option to revert via settings.
Importance
2/10: This is a low impact feature update for Mac users with a built in opt out setting and no required administration.

Microsoft Summary

PowerPoint for Mac now imports only necessary slide masters and layouts when pasting slides with Keep Source Formatting, reducing file size and improving performance and collaboration. Users can revert to the old behavior via settings. Rollout began late September 2026, completing by late October 2026. No action required.

Message Center ID
MC1492155
Category
stay Informed
Severity
normal
Services
Microsoft 365 apps
Tags
Feature update, User impact
Published
2026-10-08
Last updated
2026-10-08
Expires
2026-12-04

[What and why] We're improving the PowerPoint Keep Source Formatting paste experience. When users paste slides using Keep Source Formatting, PowerPoint will now import only the slide masters and layouts required for the pasted slides instead of importing all slide masters and layouts from the source presentation. This change helps reduce presentation file size, improve performance when opening large presentations, and enhance collaboration experiences such as co-authoring by minimizing unnecessary design content in presentations. Users who prefer the previous behavior can continue using it through a setting that allows them to choose their preferred slide paste experience. [Rollout schedule] General Availability (Worldwide): Rollout began in late September 2026 and is expected to complete by late October 2026. [Impact on your organization] Who is affected Users of Microsoft PowerPoint for Mac who paste slides using the Keep Source Formatting option. Platforms and services Microsoft PowerPoint for Mac What will happen When users paste slides with Keep Source Formatting, PowerPoint will import only the slide masters and layouts required by the pasted slides. Presentation file sizes may be reduced because unnecessary slide masters and layouts will no longer be imported by default. By minimizing unnecessary design content, smaller presentations may open faster and perform better during collaboration and co-authoring scenarios. Users who prefer the previous behavior can continue using it through a setting that allows them to bring over all slide masters and layouts from the source presentation. [Action required and recommendations] No action is required. [Compliance considerations] No compliance considerations identified. Review as appropriate for your organization.