Issues after installing office 365

Now that we installed office 365 on a clients pc , the libreoffice files with odt file extension are changed , even when we open the files in Libreoffice instead of office 365 the document has changed. It opens correctly but doesn’t display the document like it was before.

On IRC the submitter said that the files were not saved in Office365 but nevertheless the content changed. The only recommendation I currently have is to compare a backup of such file with the new changed file on XML level. Each file (.odt, .ods, …) is a zip container with several individual .xml files, so unzip and compare the XML streams.

right now the odt file is showing as a single file and is set to open with word by default after installing office365 , i am able to right click and do open with “libreoffice” , am i to do something else with the file so that it opens corrrectly , you said it should be a zip container with several individual files

I don’t know what to do so the file opens correctly. This is to find out what Office365 actually changes in the file. So unzip both (old and new) files to separate locations, prettify (for example using xmllint --format or some other XML prettifyer) content.xml in both directories and produce a diff of the two files and see what differences you find. If none then try with styles.xml. If this is all mumbo-jumbo to you then this is not for you and you should find someone who can do.