Using older versions of Outlook for Mac in business environments
Found a solution that seems to work for me. I have Office for Mac 2011, version 14.4.6 and Yosemite 10.10.1 though I also experienced the "sync pending..." issue with Mavericks. I found help in another forum that suggested creating a New Identity for the Microsoft Identity Database. I found though that I simply needed to rebuild my Main Identity. I did this yesterday and have had no "sync pending" hangs since then. Here is the url to MS support for rebuilding your Main Identity. http://support.microsoft.com/kb/2360509
Good Luck.