Comment 124 for bug 633352

i have (had) the same problem with Thunderbird 45.3 and Exchange on Windows 7 PC .

There where only 2 files in the mentioned folder \calendar-data\ . One was "delted.sqlite" and one local.sqlite.

As i have no clue, how to turn on logging i tried delting both files. This worked for me. After that only "local.sqlite" reappeared until i dismissed the old calendar reminder, then "delted.sqlite" appeared too.

I noticed this problem always appears after a password change on Exchange and mail login, if you didn't dismiss the invite before the password change (company policy... every 3 month^^ ).