Mimail is a family of simple mass-mailing worms which send various messages with infected EXE or ZIP attachments.
Some of the variants contain payloads such as stealing credit card information or Distributed Denial-of-Service attack against certain website.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
Detailed descriptions of Mimail variants are available in separate documents:
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