>>>how can check by code if it is installed, thank you
>>>
>>>
>>Issam,
>>
>>I provided you with the two ways of checking if it's installed. The simplest way is to try to create an Outlook.Application object in try/catch test.
>
>When Issam wrote installed, I'm pretty sure he meant installed AND configured.

There is also a possibility of checking for profiles (there is bbProfiles file in Downloads section here).