Each of the following Excel Templates is an Excel calendar for 2011. The templates have been created in Excel 2003, so they can be opened in Excel 2003 or any more recent version of Excel. Choose from the single page summary or the month-per-page spreadsheet.
Calendar 2011 - single page
Calendar 2011 - page per month
There is also a large selection of Excel 2011 Calendar Templates, that can be downloaded for free from the Microsoft Office website.