This letter thanks someone for being available when you were having a rough time.
1234, Main Street
Boston, MA 02123
07 April, 2005
<Recipient Address Goes Here>
Special friends like you are one in a million! Thank you so much for really sticking by me during such a tough time. I was really at my wits end! I honestly don't know how I could have made it through the <situation> without your care and support. It meant so much just knowing I wasn't alone when faced with a daunting task or unpleasant situation.
I count myself among the very lucky to have a friend like you. I hope that you'll allow me to find some way to properly thank you for everything you have done for me.
encl: <List of enclosed items goes here>