You have a mailbox that is located on a server that is running Microsoft Exchange Server 2007.
You access your mailbox by using Outlook Web Access (OWA) and then set the Regional Settings in OWA to Japanese or to Korean.
In this scenario, the Calendar Month View displays the date as a numeric number and not as an abbreviated month name. For example, "Aug 1" display as "8 1". This is confusing because it is unclear if the date is August 1 or if the date is January 8.
This problem is caused by the User Interface (UI) localization. Exchange Server 2007 uses an unclear date format when the regional setting in OWA is set to Japanese or set to Korean.
To resolve this problem, install the following update rollup:
972076 Description of Update Rollup 2 for Exchange Server 2007 Service Pack 2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.