Both products allow you to connect to SAP BW InfoProviders and other datasources, each one with its own functionalities and characteristics. This has led many users to use both tools together.
Now the new version of Analysis Office, the version 2.1, brings with it the EPM Add-in integrated with it.
Analysis Office and EPM Add-in are still separated in two different tabs (DataManager functionalities also still come in a third separate tab), but all three tabs are now more compatible than ever.
There is one important point to call attention to, this version of EPM Add-in (EPM plugin) which comes together with Analysis Office 2.1 does not support the EVDRE function.
Please review this great blog for further information Analysis Office - BI and Planning Clients Convergence ASUG Webcast
The help files are located here: SAP BusinessObjects Analysis, edition for Microsoft Office 2.1