[Solved] “Win10 Mail and Calendar Crash”

I am running a new PC and installed win10 1703. I tried to open Mail app and found out that it crashed and closed after opening it for 2-3 seconds. I tried to search and found many blogs that showing me to uninstall and reinstall it back from App Store. I also found some posts showing me to grant FULL permission to “Users” on AppData in my user profile. But none of them can really solve the problem and Mail app is still crashing.

Until today, I open event viewer and found a lot of errors on ESENT with event ID 455.

svchost (8300) Unistore: Error -1023 (0xfffffc01) occurred while opening logfile C:\Users\kenlin\AppData\Local\Comms\UnistoreDB\USS.jtx.

I found out that UnistoreDB is a folder for Mail and Calendar. so I tried to browse into this folder and found out that the folder “Comms” and its sub-folder “UnistoreDB” are missing. I then create it by my own. Bingo! Mail and Calendar is working now! Problem Solved.

Hope this blog could also help you to resolve the Mail app crash.


Workaround on adding files or shortcuts to Quick Access in Windows 10

This afternoon, another MVP asked a question, how do we add a file or shortcut to Quick Access in Windows 10. He would like to do the same action as he could add a file or shortcut to Favorites in Windows 8 or before.

In Windows 10, “Favorites” is replaced by “Quick Access”. The “Quick Access” is letting you to browse into any folder in shortest route. If you want to add any folders to “Quick Access”, you could right click any folder and add it to “Quick Access” by selecting “Pin to Quick Access”.

After you pinned it to “Quick Access”, you could then remove it by right click and select “Unpin from Quick Access”.

But if you right click to any files or shortcuts, you will found out that there is no such option to add them into Quick Access. But if the files or shortcuts are often being executed, you could find it from the lower section of the Quick Access, “Recent Files”. But what about if they are not being executed often and you still want to add it to “Quick Access”? One of the work around way is, adding the Favorites to “Quick Access”. With this workaround, you could add any files or shortcuts to the Favorites and it will then appear to the Quick Access. On the other hand, it will be removed from “Quick Access” if you remove it from Favorites. The Favorites path in windows Explorer is “C:\Users\(username)\Links”.

Here is the regedit nodes that you have to add in order to enable “Favorites” add to “Quick Access”.

@=”Common Places FS Folder”

@=”Common Places FS Folder”

And here is the regedit nodes that you have to remove in order to disable “Favorites” add to “Quick Access”.



Please note, You will need Administrator right to pass the UAC when you add/remove the regedit nodes.


Useful links to learn Windows 10 and VS2015

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I am sure that you all are new to Win10 and VS2015. You may be looking for learning resource. Here I listed some of the sample site for you and so you could get some learning on these 2 new products.

Opportunity URLs Remarks
Developer Tools Download https://www.visualstudio.com/ Download any Visual Studio skus, including VS 2015
Developer for Windows 10  -What’s New
Get Started
All the info developers may need to write apps
Windows 10 courses in MVA https://www.microsoftvirtualacademy.com/en-US/training-courses/getting-started-with-windows-10-for-it-professionals-10629/ Great site to get online courses on Windows 10
Channel https://channel9.msdn.com/windows/ Another great online resource for Windows 10 related videos
Windows 10 Jumpstart http://www.microsoftvirtualacademy.com/liveevents/preparing-your-enterprise-for-windows-10-as-a-service/ A live event on August 14th

Windows 10 is ready in MSDN Subscription



As many of you might be waiting for this “Windows 10 ISO” for long time. A good news that it is now ready in MSDN Subscription. If you are MSDN subscriber, you are ready to download and install or update to Windows 10 now.