This did occur for VS-Desktop-3.3.90.6-Beta, too.
It does not occur for VSD 3.3.0, were Outlook notifies after start up that the .ost files are old an need to be deleted.
When installing the testversion on a fresh VM where the .ost files of the configured mail accounts are "old", Outlook does not start. The outlook.exe can be seen for some seconds in the process explorer and then disappears.
Debugview has:
107 111.804704 9088 OUTLOOK.EXE Warning: AddWebResourceRequestedFilter without SourceKind parameter is deprecated! It does not behave as expected for iframes.Please use AddWebResourceRequestedFilterWithRequestSourceKinds instead. For more information, please see https://go.microsoft.com/fwlink/?linkid=2286319 108 111.852291 9088 OUTLOOK.EXE Warning: AddWebResourceRequestedFilter without SourceKind parameter is deprecated! It does not behave as expected for iframes.Please use AddWebResourceRequestedFilterWithRequestSourceKinds instead. For more information, please see https://go.microsoft.com/fwlink/?linkid=2286319 109 112.777892 9088 OUTLOOK.EXE <process started at 16:04:26.663 has terminated with exit code 0>
in an other instance it was:
1294 4362.223504 8744 OUTLOOK.EXE Warning: AddWebResourceRequestedFilter without SourceKind parameter is deprecated! It does not behave as expected for iframes.Please use AddWebResourceRequestedFilterWithRequestSourceKinds instead. For more information, please see https://go.microsoft.com/fwlink/?linkid=2286319
1295 4363.052860 8744 OUTLOOK.EXE Unexpected message in AppHostInstance:
1296 4363.054116 8744 OUTLOOK.EXE {}Deinstalling the Beta-version and installing 3.3.0 on the same VM does result in Outlook starting again