If you want to change a file that is located in a SharePoint library and you do not want other people to access it, you can check out the file. In this manner, you will know for sure that no one else can change the file while you are working on it. In the following procedure, you first open a document, and then you check it out.
Important: You can check out a file that is located on a server that has Microsoft Office SharePoint Server 2007 or Microsoft SharePoint Server 2010 installed. To work with SharePoint in Office for Mac, you have to have Microsoft Office for Mac Home and Business 2011, Microsoft Office for Mac Academic 2011, or Microsoft Office for Mac Standard 2011.
On the File menu, click Open URL.
In the URL box, type the URL for the document that is located on SharePoint, such as http://fabrikam/shared%documents/DocumentName.docx.
Note: You have to use a URL for a document in a SharePoint library. You cannot use a URL for other areas of a SharePoint site, such as a SharePoint list or top-level sites.
On the File menu, click Check Out.