The first thing to try is a Repair Install of WLMail through Programs and Features, in case it is just corruption of a .dll file or a registry item.
Failing that, as Gary and Winston suggested, you should delete (or rename) the relevant calendar Store/Cache* and allow it to be recreated when you restart WLMail.
If you use Windows Live Calendar in WLMail by signing into Windows Live in WLMail, your WLCalendar data will be synchronised with WLMail's Calendar. If not, your old Default Calendar data will be lost.
*The Calendar Store/Caches are located within a folder named 'Calendars' within the WLMail Message Store**.
The Default Calendar Store ('DBStore' protected system folder***) is directly under this 'Calendars' folder.
There are also folders named according to each WL ID, which contains that WL ID's Calendar Cache ('DBStore' protected system folder).
**WLMail's Message Store is a directory named 'Windows Live Mail'. The path to the Message Store, in its default location involves a hidden folder, so ensure that "Show hidden files and folders" is checked under Folder Options in Windows Explorer. To find the location of your message store, in WLMail go to Tools->Options...->Advanced [tab]->Maintenance->Store Folder.
The default Message Store locations are:
Vista & 7:
%localappdata%\Microsoft\Windows Live Mail
(C:\Users\[UserName]\AppData\Local\Microsoft\Windows Live Mail)
%userprofile%\Local Settings\Application Data\Microsoft\Windows Live Mail
(C:\Documents and Settings\[UserName]\Local Settings\Application Data\Microsoft\Windows Live Mail)
***The Default Calendar Store folder, named 'DBStore', is a protected system folder, so ensure that "Hide protected operating system files (recommended)" is unchecked under Folder Options in Windows Explorer.
(Windows Live Mail 2009 14.0.8089.726 on Vista Home Premium)
"There are more things in Heaven and earth, Horatio, than are dreamt of in your philosophy." - Shakespeare
"steal25" <email@example.com> wrote in message news:906999A3-F323-460B-AF23-66F3D8192B9A@microsoft.com...
> i just installed mozillas mail client works great but i really liked windows live but until they fin a fix for this ill have to stick to mozilla thunderbird. sorry microsoft.
> "steal25" wrote:
>> when i click "new" to start sending an email as soon as the new window pops up the whole program freezes and wont even allow me to shut it down without going through task mngr. after shuting windows live mail down with the task mngr and i try to reopen mail live an error msg pops up and says your calendar contains corrupt data and is forcing windows live mail to close error (0x800706BA)