Folder Contains Excess Whitespace Error

​​Folder contains excess whitespace: Certain IMAP systems (imap.googlemail.com, etc.) do not allow folders to contain duplicate whitespace characters. For example, trying to create a folder called "A  B" (with two spaces between "A" and "B") may result in this error.

Resolution:

Rename or filter source mailbox folders to avoid duplicate whitespace characters, and resubmit your migration.

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