If you use LibreOffice in an environment where you need to share documents with Microsoft Word users, you should have little or no trouble exchanging document files. However, very complex documents can require editing after opening. Complex documents are documents containing, for example, complicated tables, Microsoft Office macros, or unusual fonts, formatting, or graphical objects.
In case there should ever be issues with opening documents, try the following strategies:
Text Documents. Consider opening text documents in the original application and saving them as RTF or plain text (TXT). However, saving as plain text means that all formatting will be lost.
Spreadsheets. Consider opening spreadsheets in the original application and saving them as Excel files. If this does not work, try the CSV format. However, saving as CSV means that all formatting, cell type definitions, formulas, and macros will be lost.