Announcement about anniversary, not sure about vocabulary and grammar, thanks in advance!

Wow, haven't been here for two years, the site has changed so drastically! Sitting with the baby at home has made my brains completely blank...The teachers here used to help me so much in the past as I am not native speaker... I will appreciate if someone could advise on the following news, that I need to add to the corporate site...Thank you in advance for your help!

December 18, 2008 – We are 5!

We are proud to announce about our 5^th official anniversary. 5 years of hard work, 5 years of development skills polishing, 5 years of steps forward and sometimes back… 5 years of tightening up of business relations with our valued customers and partners… We strongly believe that all the little steps we made up till now will lead us to great results in future; they actually do now! We take this opportunity to express our deepest gratitude to all our customers and our high appreciation of your faith is us. This is you, who make us move forward, this is you, who make us mature, this is you, whom we dedicate your anniversary!