2.1.720 Part 1 Section 18.9.3, cellMetadata (Cell Metadata)
For additional notes that apply to this portion of the standard, please see the notes for valueMetadata, §18.9.17(a).
a. The standard states that the values of the count attribute are defined by the XML Schema unsignedInt datatype.
Office requires that the count attribute has a maximum value of 2147483647.