An invalid exchange server certificate appearing when you start the MS Outlook 20007 or 2010. For example, the web server fully qualified domain name is webmail.whaddya.com.

This procedure is for you if you are using the following online services provided by Microsoft.

• Office365
• Recently upgraded from Exchange Server 2010 to Exchange Server 2013.
• MS Outlook 2007 or 2010

Microsoft sent out an email on how to manage MS Outlook using the new Exchange Server 2013 environment. The new environment provides many features that admin and users will be able to appreciate after your successful transition. I agree with you, the process provided by Microsoft (and even their customer service still using the old procedure when I called them as of 5/15/2013) is NOT detailed but I have a simple solution to fix it. The procedure that help me re-configure all MS Outlook to connect using Offic365 Exchange Server 2013.

I login to the Outlook Web Apps using the user workstation email address and password, click on PC tab to run the Setup. It will download a program for Office365 Desktop, and restart is needed.

If you have any users, having a connection problem using their MS Outlook. Here's what you need to do. 

• Close MS Outlook. 
• Go to Control Panel, Email, Email Accounts 
• In Email Account, select click on the Name e.g. yourname@whaddya.com (this is user email address), then click Repair. This will automatically update the user mailbox connection setting via autodiscover for the domain name. The user need to enter their email password for authentication. 
• Click on Close to update your setting. 
• Open MS Outlook program, MS Outlook will ask you to restart to accept the new settings. 
• Re-open MS Outlook, and make sure it is not connected Offline (lower right corner of the screen). 

If you have a domain name from GoDaddy one of the largest domain name registrar in the world. You need this additional information for you to secure your account.

GoDaddy called it as Two-Step Authentication (see attached picture), in information technology industry we simply call it as Two-Factor Authentication

If you missed reading these articles related to Two Factor Authentication.
Securing Gmail  with Two-Factor Authentication.
WordPress Two Factor Authentication.

Two Factor Authentication
Some services uses a time-based smart cards that provides random six numbers every 60 seconds, and other services use your smart phones to receive random six numbers. For GoDaddy Two-Step Authentication is using your smartphone. This makes sense, you carry your smartphone everyday so no added apps or reading device for additional security to protect your account. I see the future of smartphone as a personal key to connect to your virtual world.

As of today, you can use your smartphone to surf the Internet, pay bills, connect with your family and friends through different social media, take pictures and become your primary photo album, and security.

Let's go back to the topic e.g. Two Factor Authentication.

How to enable Two-Step Authentication using your GoDaddy Account?
Login to your GoDaddy account using your Customer number or email address, and your password.
Click on My Account.
In My Account, click Update Security Setting. Here you will see the Two-Step Authentication. Enable it, and the system will send you a verification code that will expire on a given time limit.

That's all. You just added second layer of security to your GoDaddy Account.

Now every time you login to your account, you will be prompted to enter a Validation Code. As shown below.

I hope this article help you minimize risk of account exposure from malicious users.

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The old Office365 Outlook Web Apps using Exchange Server 2010.

When you create a meeting schedule for number of days, you will see an error  "This resource doesn't accept meetings longer than 1440 minutes". By default the mailbox or room was set for a maximum limit of 1440 minutes.

Here's how you can disable this limit.

• Login to the Office 365 Administration Console
• In Microsoft Office 365 Exchange, click on Manage.
• In Manage My Orgnization, click the drop down arrow, and click on Select on Another User. This will prompt you to select the mailbox or room to manage.
• Select a Mailbox or Room, click OK.
• In Option, click on Settings.
• In Scheduling Options, un-check the "Limit meeting duration", then click on Save.