Can't sign into email

Microsoft or my server will not let me sign into my Outlook email account. Each time I try I get:

Something went wrong

An unexpected error occurred and your request couldn't be handled.
X-ClientId: DYXO - L9U3 - G0QF - GWV0LASWG
X-OWA-Error: System.ArgumentNullException
X-FEServer: BY2PR04CA0069
X-BEServer: BLUPR18MB0116
Date: 10/14/2015 12:07:25 AM

Does anyone know what this is and if I can fix it. Everytime Windows 10 updates I have problems. I have two Outlook accounts. I can not sign into one of them.

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Clarification Request
Be aware that you have more than one posting about this.

And they are not the same. As such you will get conflicting answers.

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Email Accounts

I take it back. Now I can't sign into both of them.

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Since you or your company has an Exchange Server

Your admin on the server needs to see what's up. We know that for Exchange Server it may have to be very current and us using 10 Pro to use ES for the signin server.

For now, try using a local account until your company IT can get it fixed.

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Call MS

I've also logged a call earlier with MS, who were very quick to respond.

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