Outlook calendar appointments disappearing

[armadillo]

Hi,

One of the user's calendar appointements have dissapeared, the calendar is shared by another user who l books appointement etc for the main user. the problem is all of the appointments from january till the third weeek of March just disappeared except the recurring appointments.

 

The main user doesn't use a blackbery or iphone to synch outlook.

 

Any help would be appreciated and thanks in advance fpr your help.