I use WLM 2012 with Windows 7 Professional (both fully updated).

At January 14 2016 I noticed that all my calendar items (4 years of data) had disappeared. Also the name of the calendar had changed into the name of my WLM-account (without a selection box in front of the name and a down-arrow after the name) and it was the only available calendar. Clicking the button "Calendar" in the "New" section of the ribbon had no effect (as far as I could see). I suspect "Update for Windows Life Essentials Mail 2012 (KB3093594)", which I applied at January 8th 2016, as the cause of this problem.

I only use WLM at my desktop computer and don't synchronize with any other calendar. Therefore the setting in "Option/Mail/Connection/Connecting to Windows Live services" always was "Stop signing in". About two years ago I was experimenting and did log into my WLM-account. After restarting WLM my calendar had disappeared. I succeeded getting it back by changing the before mentioned setting in "Sign in" and then, at every the start-up of WLM, clicking the "Cancel" button in the "Sign in to Windows Live Mail" window. This was still the way I worked with WLM till the Calendar disappeared again at January 14 2016.

After changing the before mentioned setting back to "Stop signing in", I find a calendar with the name Calendar (with the drop down menu), but without any items (and now it is possible to add new calendars by clicking the button "Calendar" in the "New" section of the ribbon).

I find files "WLCalendarStore.edb" and "WLCalendarStore.pat" together with a file "edb.chk" in the following locations:
01) WLM Store FolderCalendarsDBStore
02) WLM Store FolderCalendarsDBStoreBackupnew
03) WLM Store FolderCalendarsBackup 2016-01-15 01.10.01
04) WLM Store FolderCalendarsBackup 2016-01-15 01.10.01Backupnew
05) WLM Store FolderCalendars(name WLM account)Backup 2016-01-09 09.39.11
06) WLM Store FolderCalendars(name WLM account)Backup 2016-01-09 09.39.11Backupnew
07) WLM Store FolderCalendars(name WLM account)DBStore
08) WLM Store FolderCalendars(name WLM account)DBStoreBackupnew

09) C:\UsersPimAppDataLocalMicrosoftWindows Live MailCalendarsDBStore
10) C:\UsersPimAppDataLocalMicrosoftWindows Live MailCalendarsDBStoreBackupnew

The largest file "WLCalendarStore.edb" is that in location 06: 8216 KB.

I see also other files in the same locations:
a) edb.chk
b) edbHHHHH.log
c) tempedb.edb
Where "HHHHH" for a hexadecimal number of 5 digits. Not all 4 files are present in every location.

My question is can I get back my disappeared calendar items, and how?

I am not sure what the 'active' location is, but my guess is location 01.
Can I copy the files "WLCalendarStore.edb" and "WLCalendarStore.pat" from location 06 to location 01?
Location 06 also contains a file "edb0037F.log". Do I have to copy also that file to location 01?
Any other ideas?