title: Is ODBC / Win7 64-bit / Excel 2010 64-bit limited to 255 columns?
body: <p>I'm using ODBC to write to an XLSB file.  Am I limited to 255 columns (or somewhere close to that)?  When I try to write 500 columns I get the following error:</p>
  
  <pre><code>HY001 -1040 [Microsoft][ODBC Excel Driver] Too many fields defined.
  </code></pre>
  
  <p>Perhaps I have the wrong drivers?  Here's my connection string:</p>
  
  <pre><code>"Driver={Microsoft Excel Driver (*.xls, *.xlsx, *.xlsm, *.xlsb)};Dbq=PATH_TO_XLSB_HERE;DefaultDir=OUTPUT_FOLDER_HERE;"
  </code></pre>