Bonjour,
Pour Benahmida...il y a peut-etre cette solution :
Delete the EXTEND.DAT File
The EXTEND.DAT file includes a cache of Outlook add-ins that are selected in the Add-In Manager. Deleting EXTEND.DAT will cause Outlook to verify the selected extensions and recreate the file when Outlook is next launched.
To delete the EXTEND.DAT file, follow these steps (Steps for Windows XP):
Close Outlook.
Click Start, Find, Files or Folders.
In the Named box, type: Extend.dat, and select Include subfolders.
In the Look in list, select My Computer, and click Find Now.
In the search results, right-click the file name, and then click Delete.