Signing in to one account loops to another account

Does anyone know how to fix this problem? I posed it to Microsoft support awhile back, with no response...very poor customer service if you ask me!!! Everything worked fine until Outlook.com got rid of the feature where you could have linked accounts (in upper right corner, could switch from one account to another without logging in and out individually.). Since then, I have not been able to sign into my business email, as when I do, it sends me to the inbox of my personal email. I have information in the business account that I need access to ASAP or I am going to lose customers!! All my information for them is in that inbox....emails, phone numbers, contact names, etc. All the other accounts login just fine. I have tried logging in on 3 different computers, on EI and Firefox, thru outlook.com and Hotmail.com, and by downloading all my emails into Outlook and Outlook Express...with no luck. If anyone knows how to fix this, or if someone from the Microsoft support sees this, can you please let me know. Thanks.