Blocks

hello all!
I want to create a new block for fetching mail headers from an Exchange Server(LDAP  authenticated as moodle)
for beeing more specific....
I want to create a new block

    to display and the number of unread email messages
    or possibly fetch and display the mail headers of  these new mail messages

for each user that is
    authanticated through moodle from an LDAP server

and also to add the feature on clickiking these items
    either on the number of unread email messages
    or the mail headers
to redirect the user to the exchange server (witch also authanticates through LDAP) and displaying him these emails

PLEASE POST HERE ANY AVAILABLE DOCUMENTATION LINKS FOR SUCH TASKS IN PHP and anything to help complete this block.Is out there abything simmilar? I think a lot of people need this functionality.

I want to Thank you in advance for your time and knowledge,
aggelos

P.S.: Excuse my bad english .. please post here to expalin again if you dont understand!