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Known issues

Below is a list of known Corso issues and limitations:

  • Corso supports Exchange (email, calendars, contacts), OneDrive (files) and SharePoint (Document Libraries) M365 data. Additional data types and services will be added in subsequent releases.

  • Backups of Exchange email may not include changes to the read status of an email if no other changes to the email have been made since the previous backup.

  • Restoration of Nested attachments within Exchange Mail or Calendars aren't yet supported.

  • Folders and Calendars containing zero items or subfolders aren't included in the backup.

  • Provides no guarantees the inclusion of data that's moved, added, or deleted from M365 while a backup creation is running. The next backup creation will correct any missing data.

  • Sharing information of items in OneDrive/SharePoint using sharing links aren't backed up and restored.

  • Permissions/Access given to a site group can't be restored.

  • If a link share is created for an item with inheritance disabled (via the Graph API), the link shares restored in that item will not be inheritable by children.

  • Link shares with password protection can't be restored.

  • Teams message replies are only backed up if the parent message is available at the time of backup.

  • Groups SharePoint files don't support Export. This limitation will be addressed in a follow-up release

  • Teams messages don't support restore due to limited Graph API support for message creation.

  • Groups and Teams support is available in an early-access status, and may be subject to breaking changes.

  • Restoring the data into a different Group from the one it was backed up from isn't currently supported.

  • Backing up a group mailbox(aka conversations) item may fail if it has a large number of attachments (500+).

  • Exchange in-place restore may restore items in well-known folders to different folders if the user has well-known folder names change based on locale and has updated the locale since the backup was created.

  • In-place Exchange contacts restore will merge items in folders named "Contacts" or "contacts" into the default folder.

  • External users with access through shared links won't receive these links as they're not sent via email during restore.

  • Sharepoint list item "attachments" aren't backed up, restored or exported as graph APIs doesn't currently provide attachment data for Lists or List Items.

  • Group mailbox restore isn't supported due to limited Graph API support for creating mailbox items. EML export is supported.

  • Due to Graph API limitations, any group mailbox items present in subfolders other than Inbox aren't backed up.