This link explains why you may appear to be missing your mail folders after an upgrade: [[:Email#After_I_upgrade_my_SMESERVER.2C_my_email_folders_have_disappeared_when_using_IMAP|After I upgrade my SMESERVER, my email folders have disappeared when using IMAP]]
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This link explains why you may appear to be missing your mail folders after an upgrade: [[:Email#After_I_upgrade_my_SME_Server.2C_my_email_folders_have_disappeared_when_using_IMAP|After I upgrade my SME Server, my email folders have disappeared when using IMAP]]