Whenever I start Thunderbird and it indexes the contents, my calendar synchronization stalls at 931/940. I can see this in the activity manager. This information is produced every time I open the program and when I use the clear button at the bottom this message remains so that after a time I have multiple instances and have to use Parhelia Thunderfix to rebuild. I am using Google Calendar so I think that I have some corrupted instances in the calendar which will not synchronize and I don't know how to locate and delete them. I appreciate that this is may not be a Thunderbird problem but if it is not would appreciate suggestions on where to post the question to find out the answer