Once a server is running for some time, one of the things an administrator wants to know is the 'performance information' of the growth of his information stores. This way it's possible to generate graphs to help you implement storage limits, or helps you calculate when to add storage if needed.
VBScript can use WINS and ADO to connect to Exchange and extract this kind of information, example scripts can be found here:
http://www.servercare.nl/Lists/Posts/Post.aspx?ID=87 and here:
http://www.servercare.nl/Lists/Posts/ViewPost.aspx?ID=20