OCS Server store all informations in a MySQL (MariaDB) database and update data when agents send its own inventory.
You have the abilities, at anytime, in 'All Computers', to select columns and then export (Download) a CSV file to import in a Excel (Calc) file. it's very quick to do.
Better, OCS had an integrated search module, with again the column's selection and export (Download)
So I don't understand why use an Excel file would provided 'better usage' than direct access thru web interface ...
As the selection of columns and download is based on a SQL instructions, it's possible to use Excel Connections to get the same informations in Excel file : you need to search in tables of database : main informations are in table 'hardware', but if you want also administrative fields it will be harder ...