Skip to main content

An invalid certificate error when opening MS Outlook 2010

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.

Background:
Before Office365 hosting our email address (mailboxes), we used webmail.whaddya.com for our Outlook Web Access (OWA) and we bought a SSL certificate to provide secure connection from workstation to server.

I transitioned our email using Office365, so the old Exchange Server and website webmail.whaddya.com is no longer active, so as the SSL expired after a year.

Then, an invalid server certificate now appearing when I started the MS Outlook 2010 application. The MS Outlook still see that webmail.whaddya.com though I am now using Office365 service. Similar to Internet Explorer, the cache records still exist.

To remove the old data e.g. webmail.whaddya.com, follow this guide.
  • Open Regedit
  • Go to HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\AutoDiscover
  • Right click on AutoDiscover, New, DWORD 32-bit value
  • Value name: ExcludeScpLookup
  • Value data: 1
  • Base: Hexadecimal
Click OK to finish.

Close MS Outlook, and re-open again to check if the invalid certificate is gone.

If this helped you, please take the time to share this post by sharing using Google+, Facebook, Twitter, or LinkedIn

Comments

Popular posts from this blog

Office365 - This resource doesn't accept meetings longer than 1440 minutes

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 ConsoleIn 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. That's all. You can now schedule a meeting or reserve a room for number of days.

Hope this help you.

If this helped you, please take the time to share this post by sharing using Google+, Facebook, Twitter, or LinkedIn

Out of Office Reply for Termed Employee

This is a sample Out of Office message that I used for termed employees, unless HR staff specified a different message.

=== Example for KING.NET Employee ===
John Doe (employee or consultant) is no longer with KING.NET effective June 1, 2013 (termination date). For matters relating to "Project Name here" please direct your concerns to John Smith at johnsmith@king.net (Manager or Supervisor). For all other matters, please direct your email to Mary Smith HR at marysmith@king.net.

Please call our main office 703-345-6789 if you have other concerns.
Thank you.

=== End of message ===

I posted this article year 2008 from my old blog.
http://whaddya.blogspot.com/2008/11/example-of-out-of-office-reply-for.html


If this helped you, please take the time to share this post by sharing using Google+, Facebook, Twitter, or LinkedIn

Facebook Business Valuation

Interesting post from Techcrunch.com about the Facebook valuation and I would like to share this to you folks. The picture graph provide a thousand words to fully explain their growth. Please click the image to see in full screen.