Fast merge support for legacy documents

A method is presented for merging document metadata at a client computer. A document obtained from a server computer is opened by a user at the client computer. If the document does not include paragraph identifiers, a paragraph identifier is assigned to each paragraph in the document. When the document is opened by a second user at a second client computer, metadata for the document is received from the server computer. A determination is made whether to merge the metadata received from the server computer with current metadata for the document. When it is determined that the current metadata and the metadata received from the server computer should be merged, paragraph identifiers are adjusted in the document based on the metadata received from the server computer.