Open Exchange

I was not using Open Exchange for my email account, but just for storing all of my contacts and information. I'm using Zoho Mail for my email account.  All of a sudden Open Exchange seems to have disappeared.  I'm being redirected to Round Cube, which I have no interest in.  Where the heck are all of my contacts and information?  How do I get them back?  I resent being bullied into using something that I don't want.