What happens if emails exist in multiple folders / locations in the source?

Platforms

Exchange & Microsoft 365, Lotus Notes, Zimbra, GroupWise, etc (all except Google Workspace).

Explanation

Emails which exist in multiple folders will only be migrated once, from the first folder in which they are found. For all other folders, they will be skipped as "Already Exists" (in the destination). This may result in whole folders contents not being migrated.

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