While the Microsoft Office Online templates site certainly offers an abundance of calendar templates, such as a quarterly business calendar for Word and a Julian calendar for Excel, there are many other sites where you can download Office 2010 calendar templates as well.
A site called General Blue offers several basic templates for both Word and Excel. If you select the Office 2007 version, it should download directly to your Office 2010 application.
Vertex42.com has a pageful of Excel calendar templates, including a year calendar with notes and a multiple-year calendar. This site does not differentiate between versions of Microsoft Office, so any template you choose should open automatically in Excel 2010.
CalendarLabs.com has a wide variety of calendar templates that are compatible with Microsoft Word, from basic to decorative. Simply click on the template you want to use and it will open as a new Word 2010 document.
If you are looking for a PowerPoint calendar template, Presentation Magazine offers one that loads as one month per slide with room for notes and events.
Once you have found and downloaded an Office 2010 calendar template to suit your needs, you can customize it, add your own images or anniversaries and even save it as a PDF, if you choose.