shared calendar improvements

Shared calendar improvements are currently presented as a cautious Microsoft 365 and Outlook deployment topic. The available guidance says organizations should avoid enabling these changes broadly while Microsoft investigates workflow-breaking issues in classic Outlook shared calendars. A single-instance edit to a recurring meeting in a Microsoft 365 Group Calendar may update every instance, while delegates may send attachment-related meeting updates that recipients do not fully receive. The recommended approach is to pilot with users who manage delegated calendars, recurring group-calendar meetings, or attachment-heavy workflows. For meeting materials, administrators should require SharePoint or OneDrive links when delegates update meetings. This tag tracks that rollout guidance and related risks.