At startup, system goes into "disk repair" for a few minutes then boots normally. The only thing that appears to be missing is files in thunderbird inbox. System is a Lenovo k450e. It first happened in September about 3 weeks after migrating email to the new system. Then happened again today. (11/7) Lenovo tech support was no help. They suggested reinstalling thunderbird. They thought I might have an "incompatable" version. I am running the latest Ver ( 31.2.0) . I have 3 email accounts set up. Yesterday, I did delete a bunch of files from the Inbox on one of the IDs. On Both occasions the inboxes of the 2 active accounts were lost. The inbox on the inactive account appears ok. That account has not received any messages on this system. Also, I have never performed the "file compression" or what ever it is called in thunderbird on this system... Any suggestions would be greatly appreciated