RM412619 - Outlook: Choose how many days of emails sync to your device for offline usage
Microsoft 365 Roadmap
Summary
With the new sync window, you can choose how many days' worth of emails and attachments you want to download to your device so you can always access them even while offline.
With the new sync window, you can choose how many days' worth of emails and attachments you want to download to your device so you can always access them even while offline.