Chorus:
Autodiscover
There is no other
Way to decide
Where your mailbox is stored
 
Autodiscover
Your sister and brother
Exchange Admin and mother
Will be proud if you do
 
You may be tempted to wing it
Use a hardcoded link submit it
But performance will suffer
When you’re left to your druthers
Should have Autodiscovered 
Then all would be well
 
>>Chorus
 
Call it once for each mailbox of interest
Pair the link and mailbox for each request
If you encounter errors
Refresh once again
For more information search M-S-D-N for 
 
>>Chorus
 
Exchange won't exist in a bubble
If you think that it will you're in trouble
Add a site, one or two 
And your perf will be through
Unless you step up and decide that your app will just...
 
>>Chorus
 
Autodiscover, 
Autodiscover, 
Just AutoDiscover for me.
It’s just plain XML