I've been having a strange issue a while now. I am using MIUI ROM ICS 2.6.1 on my I9100. My calendar app isn't showing anymore. I can see that it still reads the calendar data as I have a third party calendar widget that display the data, but I have no way of opening up my calendar. If I go into settings and apps I don't see the calendar app listed - it just lists the calendar storage. I have also had a look at system/app and the calendar.apk is there. I've also tried replacing with another calendar.apk and it doesn't work. Can somebody please help me.