22. The method of claim 12 , further comprising: receiving a modification to the preview specifying a modification version; identifying a document version associated with the native document; determining that a version conflict exists by comparing the document version differs from the modification version; and when the document version differs from the modification version, reconciling the conflict.
22. The method of claim 12 , further comprising: receiving a modification to the preview specifying a modification version; identifying a document version associated with the native document; determining that a version conflict exists by comparing the document version differs from the modification version; and when the document version differs from the modification version, reconciling the conflict. 23. The method of claim 22 , further comprising identifying a row or column modification of the native document for a version of the native document corresponding to the document version relative to a version of the native document corresponding to the modification version; and wherein reconciling the conflict comprises altering the modification based on the row or column modification.