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.