exchange server signature

we have exchange server 2007 and 120 mailboxes.

I would like to make a signature for all 120 users,when they send mail that signature comes automatically.

can some one give me step guiede how can i do that in exchange server?
these informations should in signature mask:

Best Regards
sender name:

Tel:
Fax:
some text here .....
orkinosAsked:
Who is Participating?
All Courses

From novice to tech pro — start learning today.