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My calendar has completely stopped working. The furthest I can get is to the Month view, but as soon as I try to look at any events or switch to Agenda view it freezes completely, and sometimes locks up my entire phone.
I suspect the calendar is in conflict with another app. I'll try uninstalling a couple and seeing what happens.
This is the default Calendar app that comes with an HTC Desire HD.
Also FYI my calendar synchronises with a number of calendars that are all owned by one Gmail account.
I had this issue with my HTC Desire HD as well and have found a fix for it.
i) Go to Manage Applications >> All Apps; Tap the "Calendar" app (this will likely show you a memory usage of 8.00 KB). Tap the "Clear Data" button. This will give you temporary respite. i.e. I cleared data, it worked fine for a while and then gave me the same problems once the data filled up (presumably)
Outlook 2003? Seems a little dated for future-tech synchronising. I know it's not what you want to hear but perhaps its time to change.
Syncs perfectly with my DHD using MyPhoneExplorer. 
Hi, has anyone had any problems with their HTC Desire HD calendar entries? My husband and I have the same phone and quite weirdly both our calendar entries have disappeared overnight. Birthday's, appointments & engagements everything gone?! It was all there the night before last but gone yesterday & it seems strange it's happened to both our phones at the same time - spooky. Has anyone got any ideas?