The vendor has published 1 unique mention(s) for this bug: 1. Attempts to mount the OutlookOST.vhdx or the OutlookSearchIndex.vhdx file might fail intermittently with a 0x80070020 error. The issue occurs when you log off from a session and launch another session immediately. Latest urls for this bug: 1. https://docs.citrix.com//en-us/profile-management/1912-ltsr/whats-new/cumulative-update-2/fixed-issues