comcast cannot seem to resolve my problem so i thought zimbra the developer can help me.. The calendar will open from a remote site.. tried clearing ie8 cache but does not resolve calendar problem.Have windows 7.When hit the calendar logo in smartzone the screen flickers for a few seconds and then goes back to the smartzone e-mail homepage.The calendar url will appear bottom left but no access. I am not getting any error message.. can get into other smartzone tab-adresses,preferences etc. but not calendar. Perhaps you can help me. A frustrated user. Thanks!!