Solved: I didn't have to use the command line or remove any ibex.index files. I was able to fix it by using the GUI. I use Evolution as an imap client.
Steps: Close Evolution Click the "Places" menu item and select "Home Folder" Click the "View" menu item and select "Show Hidden Files." Open the "imap" folder located under .evolution/mail. Locate and open the folder for the mail account having the problem and delete the "folders.db" file inside of it. (Screenprint: http://ubuntuone.com/2GJY8lJulShlCCzZkDnNK0) Start Evolution application The "folders.db" file will be automatically re-generated. Error message gone. Ubuntu Release 10.04 (lucid) Kernel Linux 2.6.32-35-generic GNOME 2.30.2 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to evolution in Ubuntu. https://bugs.launchpad.net/bugs/381164 Title: database disk image is malformed Status in “evolution” package in Ubuntu: Expired Bug description: Binary package hint: evolution hello, my system: ubuntu studio 9.04 64 bits evolution impossible to read and see all the mail in my box recpetion and in an other file. ERROR MESSAGE : error during the generation of the list of messages database disk image is malformed thanks for the answer David ProblemType: Bug Architecture: amd64 DistroRelease: Ubuntu 9.04 ExecutablePath: /usr/bin/evolution NonfreeKernelModules: nvidia Package: evolution 2.26.1-0ubuntu1 ProcEnviron: LANG=fr_FR.UTF-8 SHELL=/bin/bash SourcePackage: evolution Uname: Linux 2.6.28-3-rt x86_64 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/381164/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

