We recently switched domains to have a central domain name instead of a location dependent setup. Whilst using a user profile migration tool, we came across a bug where the Windows Store would either disappear or just be unusable. This means that several useful applications for the end-users would stop working, for example : Sticky Notes, Calculator and even Microsoft Photos.
The solution was to download all the packages again and reset the store.
Run the below from powershell (run as admin) to download/install all packages
Get-AppxPackage -AllUsers| Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml”}
The above command might throw a few errors, but will still complete. Once done, run the below from a command prompt ( run as admin )
wsreset
Once you have run the wsreset, you should either see the Store open up automatically or you’ll be able to find it to install all the applications required again.