As the error description explains, this error happens if you have a corrupted or outdated MAPI DLL installed on your machine. Usually this happens when you'd installed a newer version of Microsoft Office and then installed an older one.
The entire text of the error message is this: " Cannot start Microsoft Office Outlook. DLL is corrupt or the wrong version. This could have been caused by installing other messaging software. Please reinstall Outlook. If you work in a corporate environment and your company uses an Outlook Exchange server, then the "unable to open Outlook" problem may be caused by something known as Cached Exchange Mode.
When the Cached Exchange Mode is enabled, it saves and regularly updates a copy of your Exchange mailbox on your computer. If you don't need this option, then turn it off and you should no longer get the error.
Another error that may occur in the Exchange server environment is related to a missing default gateway setup. I'm not really sure what it actually means, but fortunately for us Microsoft has an explanation and automatic fix for Outlook and You can download it from this page.
One more cause of errors when starting Outlook is disabling the Encrypt data between Outlook and Microsoft Exchange setting. If it is the case, you will see the errors like these:. And again, Microsoft has provided the detailed information on how to cope with this problem, you can find it on this page.
If you cannot start Outlook because of an error message similar to this one: " Cannot start Microsoft Outlook. MAPI was unable to load the information service msncon. Be sure the service is correctly installed and configured ", know that it is the Microsoft Hotmail Connector add-in to blame.
In this case, uninstall the Outlook Connector manually as recommended on this forum , and then install it anew.
Here are the download links:. Though this section does not relate directly to Outlook start-up problems, it still may be useful if you actively use Outlook in your daily work. Let me, please, quickly introduce you to 5 time-saving plug-ins that automate the following tasks in Outlook - You can find more details about the tools and download their trials by clicking the links above.
Just give them a try, and these plug-ins will streamline your email communication and enhance your Outlook experience in so many ways! Hopefully, at least one of the solutions described in this article helped to resolve the problem on your machine and now your Outlook is up and running again. If not, you can leave a comment here and we will try to figure out the solution together. Thanks for reading! Click Show Profiles, and then click Add. Cannot start Microsoft Outlook. Cannot open the Outlook window.
The server is not available. Contact your administrator if this condition persists. No Microsoft Outlook profiles have been created. Click User Accounts, and then click Mail. Disable compatibility mode by using the following steps for the appropriate Outlook installation type and version of Windows. Find Outlook. Special Function Automatic Processing Tools.
Housekeeping and Message Management. Project and Business Management Tools. Run Rules on messages after reading. Outlook Suggestion Box UserVoice. All rights reserved. Slipstick Systems is not affiliated with Microsoft Corporation. Sign up for Exchange Messaging Outlook. Please note: If you subscribed to Exchange Messaging Outlook before August , please re-subscribe. Notify of. Inline Feedbacks. March 13, am. December 12, am. Office Office Exchange Server. Not an IT pro? Resources for IT Professionals.
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