OK this has been working for a long time up until today. I believe its a zimbra issue. I can't get to connect to my calendar at all..i get this error message.:

descripion of error: [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [calIItemBase.icalComponent]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: file:///home/bwilliams/.thunderbird/dv51s956.default/extensions/%7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D/js/calIcsParser.js :: ip_parseString :: line 117" data: no]

all I did was to manually delete an item using the zimbra web interface. and now the connection using thunderburd and lightning is not working. I tried reinstalling thunderbird and still a problem. I can see other peoples calendars by the way. People who share their calendars with me i can see them..I just can't see my own. Help Help Help. this is driving me nuts.