I've been using thunderbird for quite sometime now, at least a year. This morning I opened thunderbird, and was greeted with a dialog box asking me to set up an email address. Rather confused, I closed the dialog box, hoping my emails and other data would still be there. But thunderbird remained blank, checked my calendar (which I relay on quite a lot for scheduling my day to day), empty as well, all my calendars were gone. The data stored in my calendar is of much importance, I spent a lot of time looking online for assistance, however nothing I tried fixed the problem. It seems the majority of issues related to missing calendar data revolves around the extension Lightning disappearing or failing to update properly, for me this doesn't appear to be the case. I did attempt to remove Lightning and reinstall it, this didn't fix the issue. A user profile was found in AppData/Roaming/Thunderbird/Profiles. Little was found in way of calendar data. In calendar-data folder two files were found: deleted.sqlite (96Kb) and local.sqlite(1568Kb). In the root directory: storage.sdb (96Kb) contains no references to previous calendar data, nor does storage.sqlite(1kb). System information: Windows 7 64 bit Thunderbird is version 60.9.0 (32 bit), up to date. Lightning is version 6.2.9 No crash reports, however the power went out last night due to a thunder storm. The computer would have shutdown abruptly, plus thunderbird was open when this event occurred. Some help in retrieving the data, if possible, would very much appreciated. The data information I have in my calendar is of great importance, and a major setback for me if lost. Thanks for your help.