Does OpenDocument take the requirements of Microsoft Office users into account?

Absolutely. Several companies that are members of the OASIS OpenDocument Technical Committee are very much committed to delivering office products that are highly interoperable with Microsoft Office, especially on the file format level. Some of these companies deliver products that have included MS office document filters for more than a decade. The membership of these companies in the OASIS OpenDocument Technical Committee actually ensures that the requirements of MS Office users are considered within OpenDocument.