If you have QuickBooks Desktop file older than 2015 with inventory items and try to convert to QBO, read this article first. You will need 2015 or newer version to import inventory properly. They offer you the latest trial version. Click here for trial links. This is for US version only.
Note: Even with this latest version of QBD, you may experience some issues with inventory in QBO. Also, you may want to a 100% physical inventory, and adjust current qty to match in desktop before exporting to QBO. There is no value adjustment in QBO.
See also QuickBooks Help article.
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