Hi, I'm not sure if you would like comments on the introductory text or just the letter?
For both parts of the text I'm not quite sure why there is so much capitalisation of words, capitalisation should be used sparingly. In particular, a formal letter should not use capitals unless it is the name of something, such as a company.
In the intro text, can not is usually written as one word i.e. cannot. Additionally, full stops are not normally included within a pair of brackets, they should go just outside, but this is quite minor.
On the letter, it should start as I am rather than I AM, no capitalisation is needed. Also, and this may be a personal thing, but I would say either I am looking forward to...or I am anticipating but not both, as they both have a similar meaning.
Formal letters usually don't use colons, a comma would be more appropriate, for instance it should be - Just think, after all these years...
Finally, letters to someone a person knows, which is the case here, are usually finished by 'Yours sincerely' as 'Yours faithfully' is usually to someone who you are not acquainted with. For instance, if you were applying for a job, it might be addressed to 'Dear Sir or Madam' and finished 'Yours faithfully'.
Hope that helps