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I will be happy to assist you in resolving your issue with regard to being unable to open email messages in Windows Live Mail.

 

It is possible that Mail.MsMessageStore file was corrupted. Please follow the steps below on how to repair the file:

 

1. Restart the computer (this is to ensure that Live Mail is fully shut down, and that none of it's components are in use when the computer starts)

 

2. Click Start, type CMD but do not press enter

 

3. You will see cmd.exe in the search results, right click on it and select Run as Administrator - type your admin password if asked, and if UAC pops up asking permission, allow it

 

4. You should now see the command prompt, with the following displayed:

 

Microsoft Windows [Version 6.1.7600]

 

Copyright (c) 2009 Microsoft Corporation. All rights reserved.

 

C:\Windows\system32>

 

5. Copy the following (press Ctrl+C):

 

esentutl.exe -d "%userprofile%\AppData\Local\Microsoft\Windows Live Mail\Mail.MSMessageStore"

 

Note: the "" are necessary

 

6. Right click in the command prompt Window, and select Paste, so you now see the following:

 

Microsoft Windows [Version 6.1.7600]

 

Copyright (c) 2009 Microsoft Corporation. All rights reserved.

 

C:\Windows\system32>esentutl.exe -d "%userprofile%\AppData\Local\Microsoft\Windows Live Mail\Mail.MSMessageStore"

 

7. Press enter. esentutl will now defragment the Live Mail database file

 

8. Once done, you can close the command prompt, and restart the PC again

 

If the issue persists, please notify us.

I did exactly this and it defragged 100%. When I started with the error, all my emails were there, I just could not send an email. Now Windows Live Mail 2012 will not even open!

Windows Live Mail could not be started. The application was unable to open the WLM store. Your WLM mailbox data is currently being used by another program such as a virus scanner. 0x800C0155.2