Setup an equipment Mailbox with delegate approval issue

Hi guys,

I have been trying since several days to setup an equipment Mailbox with delegate approval, but I am not able to make it work...

The server is running on Exchange Server 2010 and the client are all running on MS Outlook 2003.

I have tried everything that I read on several forums, read the Microsoft Exchange Library on Technet and tried everything. Nothing works...

This is what I would like to do :

1. An equipment mailbox already exists that reprensents a car
2. I want to set a person who is a delegate.
3. Each meeting (book the car from an hour to another) must be accepted by the delegate

Now, the metting request is automatically approved, even if I set a delegate on it.

I also tried to setup delegates on a Room Mailbox, but it also does not work.

By now, I used the Exchange Managment Console and the Outlook Web Access, no Power Shell at all. I am not a Power Shell user, I am not used to manage Exchange with it.

Please can you help me to resolve my issue ?