I've documented this as: [README.Debian] Mailbox corruption ------------------
Mailbox summary corruption is an issue that is known to appear in exceptional cases as reported in http://bugs.debian.org/295270 and http://bugs.debian.org/347703. A typical symptom is the error message: "Error while Refreshing folder: Summary and folder mismatch, even after a sync." No data is lost, but one or more summary files are corrupted. Before fixing the problem, backup your ~/.evolution folder just in case. Delete ~/.evolution/mail/local/MAILBOX.ev-summary where MAILBOX is your mailboxes. For example, the inbox summary file is Inbox.ev-summary. To rebuild the summaries, restart evolution and evolution-data-server. [/README.Debian] I'd like feedback and corrections to this text from anyone that have experienced the corruption and think these instructions can be improved. Cheers, Øystein Gisnås