There are more than 22 all-day event calendar items which occur on the same day in a Microsoft Exchange Server 2007 user’s calendar.
This user browses to that day in the calendar view by using Outlook Web Access (OWA).
In this scenario, there are only 22 all-day event calendar items that are listed. When you try to view more than 22 all-day event calendar items, the scroll bar does not work. Therefore, the user cannot access other calendar items of that day in the calendar view
Note This problem does not occur when the user access the calendar view by using Microsoft Office Outlook.
This problem occurs because of an event list limitation in the all-day event view in OWA.
To resolve this problem, install the following update rollup:
2608656 Description of Update Rollup 6 for Exchange Server 2007 Service Pack 3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.