Browser Requirement for Office 365
If you are still using the Office 2007, then update the office 2007 version to Service Pack 3
Office 2010 must be updated to Service Pack 1
OS requirement
Windows XP with Service Pack 3 (32-bit)
Windows XP with Service Pack 2 (64-bit)
IE 8,9,10 and 11.
If you choose Office 365 ProPlus (Lync,audio video chat enabled,Visio and Project)
then you must Win 7,8 or very latest Windows 8.1
if you plan to use the Office 365 then always install the 32 bit
version of Office version on your client computer.
32 bit office can be installed on both 32 bit and 34 bit OS.
64 bit Office can be installed only on 64 bit OS (Windows 7,Windows 8 and Windows 2008 R2).