After upgrading vanilla Alfresco 4.1.1 to 4.1.2 IMAP subsystem fails to start

Description

If Alfresco 4.1.1 has IMAP enabled with default settings and an upgrade is performed to 4.1.2 the subsystem will not start anymore due to the exception "Existing file or folder Imap Attachments already exists" or "Existing file or folder Imap Home already exists". Customer sees the Imap Home issue and I got at reprodcution the Imap Attachment one

Steps to reproduce

1. Setup Alfresco 4.1.1 and enable IMAP with the default values
2. Upgrade to 4.1.2 and check the log for IMAP subsystem is not starting

Expected Behaviour

Subsystem should start

Observed Behaviour

Subsystem is not starting

Analysis to date

• Tried to enable debugging but neither the subsystem nor the "org.alfresco.repo.management.subsystems" helped to get more information
• Attached find my logs (upgrade and startup) as well as my configuration
• Found similar issue on the forums for an upgrade to Alfresco 4.2 (https://forums.alfresco.com/forum/installation-upgrades-configuration-integration/installation-upgrades/error-during-upgrade)