Day before yesterday I installed the W10 "cumulative update for x64 systems" on my Surface Pro 3. YesterdayI did a cold restart. Since then the email app constantly crashes, it comes up and then just freezes until it eventually closes itself (or gets closed). The event viewer contains two events for each such attermpt. First comes: SettingSyncHost (4916) An attempt to create the file "C:\WINDOWS\system32\edbtmp.log" failed with system error 5 (0x00000005): "Access is denied. ". The create file operation will fail with error -1032 (0xfffffbf8). And then: SettingSyncHost (4916) Unable to create a new logfile because the database cannot write to the log drive. The drive may be read-only, out of disk space, misconfigured, or corrupted. Error -1032. These are both generated by source ESENT. I am a member of Administrators (and Home Users) and from File Explorer I could manually create a folder (did not get the option to create a file) in C::\Windows\System32. From an elevated command prompt I could create a file in the System32 directory. I have 425 GB free space on the SSD. So the problem doesn't seem to be "read-only, out of disk space, misconfigured, or corrupted." Does anyone have any ideas?