Unexpected Folders and Calendars
Nylas syncs all folders in a mailbox configured for holding messages. For Exchange accounts, several system folders are not visible to users using the Outbox email client. We still synchronize those folders. Most of them are located within the Recoverable Items system folder.
Depending on the setup of that mailbox, this can include the following system folders:
- DISCOVERY HOLD
- SUBSTRATE HOLDS
If your users are confused by the items in these folders, we recommend that you don't display messages stored in these folders in your application.
Revew the Microsoft documentation on Recoverable Items folder in Exchange Online.
Besides the regular calendars found in a mailbox, Nylas will also create a unique Nylas-only calendar titled Emailed Events. The Emailed Events calendar will have events discovered by parsing the attachments of all of the emails Nylas synced. An event will be created in this calendar for each ICS event invitation attachment that we find. This calendar is read-only but does support RSVP actions.