Do not migrate mail from these top- level folders
Select this option to exclude specific top-level folders from migration. Any folder at the same level as the Inbox is considered a top-level folder.
Enter a comma-separated list of top-level folder names. Folder names can include spaces and don’t require quotation marks. For example:
Folder A,FolderB,Folder C
The utility ignores any subfolder names you enter.
For information about preparing exclusion folders, see “Have users prepare exclusion folders if necessary” on page 35.
(For IMAP with Gmail)
In the case of Gmail IMAP, use label names to exclude specific folders. Gmail IMAP exposes the following system labels:
Inbox Starred Sent AllMail Drafts Spam Trash
Apart from these, users can create other labels. Other labels can be used as exclude folders, too.
Exclude folders for Gmail IMAP works slightly differently. Each message in Gmail can have multiple labels. In other words, the same message can appear as part of many labels. If a label is mentioned as an exclude label/folder, all the messages with that label will be excluded, whether or not they are labeled with other labels as well.
(For IMAP with Exchange IMAP server)
If you select Microsoft Exchange IMAP, you must add calendar and contacts folders to exclusion list.