Im not able to see my calendar appointments

I have the same problem. Last Saturday I lost all my Calendar appointments because of some changes that Hotmail or outlook made. Microsoft that is. There was no warning about changes coming so that I could have moved my appointment's to another area. This has cost me for missing some appointments for Doctors and other meetings. Then on Monday I lost many of my contacts from my Cell phone that has been on it for many years. Some cell phone contacts were completely removed and others were made only w Face time showing in its place. No number is left for texting. I am very upset with the changes that has caused me to lost phone numbers and contact information from my cell Iphone... Looking to remove everything that has Mircosoft attached to it..
Wfalme