Unknown namespace

Error

Unknown namespace

Cause

This error indicates that your IMAP server is not RFC-compliant.

For example, we find that some IMAP servers:

1. Reject the creation (or retrieval) of folders with special characters (such as "*", "-", etc.) or leading/trailing spaces.
2. Reject the creation of folders, unless they are located under the inbox folder. In other words, IMAP cannot create a "/A" folder, it must do it as "/Inbox/A".
3. Reject the creation of folders with certain reserved names, such as, "junk mail", "sent mail", and others.

Resolution

We recommend the following:

1. Determine the category of problem: special character, folder location, or reserved name.
2. Find out if the error is related to the Source or Destination (check errors in MigrationWiz).
3. Consider renaming folders at the Source to avoid special characters.
4. Connect an email client (Outlook, Thunderbird) to understand limitations:
   1. Connect with Outlook or Thunderbird using IMAP.
   2. For example, if creating folder /A fails, try creating this folder at the root.
   3. Check to see if an error is displayed to you by the email client.
5. Consider remapping folders:
   1. Edit your project and reveal Advanced Options. All Folder Mapping must added as written.
   2. In Support Only options, enter FolderMapping="^->INBOX/" FolderMapping="INBOX/INBOX->INBOX"
   3. This will ensure that /Inbox remains mapped to /Inbox, but that /A gets mapped to /Inbox/A