During .xlsx export save XML_outlineLevelRow, XML_outlineLevelCol keys In .xlsx, the XML_outlineLevelRow and XML_outlineLevelCol keys are required for Microsoft Office365 application to properly displaying Outline values.
Review: https://gerrit.libreoffice.org/#/c/27545/
Bartosz Kosiorek committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=ad121df71ad463bed8caf147d27f020b548f0862 tdf#101135 FILESAVE .xlsx Save XML_outlineLevelRow, XML_outlineLevelCol keys It will be available in 5.3.0. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
Bartosz Kosiorek committed a patch related to this issue. It has been pushed to "libreoffice-5-2": http://cgit.freedesktop.org/libreoffice/core/commit/?id=517eddcbfd8dd5d6da50210a12ba917998897bbf&h=libreoffice-5-2 tdf#101135 FILESAVE .xlsx Save XML_outlineLevelRow, XML_outlineLevelCol keys It will be available in 5.2.5. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.