For the best experience using Office 365, Microsoft recommends that the latest browsers are always used, Office clients, and apps. Microsoft also recommend that you install software updates when they become available.
Office 365 is designed to work with the following software:
- The current or immediately previous version of Internet Explorer or Firefox, or the latest version of Chrome or Safari.
- Any version of Microsoft Office in mainstream support.
Although Microsoft does not recommend connecting to Office 365 by using older browsers and clients, limited support is provided so long as that software is supported by its manufacturer. Specifically, if older browsers and clients are continued to be used:
- Office 365 won’t deliberately prevent you from connecting to the service.
- Office 365 won’t provide code fixes to resolve problems related to those clients, but it will offer security fixes as needed.
- The quality of the user experience will diminish over time.
Office 365 does not support any software used with the service that is not supported by its manufacturer.
Web browsers: Internet Explorer
Office 365 is designed to work with the current or immediately previous version of Internet Explorer. We recommend that you upgrade to the latest version of Internet Explorer after it is released. Office 365 might continue to work with versions of Internet Explorer other than the current and immediately previous versions for some time after the release of a new version of Internet Explorer, but Office 365 can’t provide any guarantees.
When accessing Office 365 from older versions of Internet Explorer, users may experience known issues and limitations depending on the versions of Internet Explorer, including:
- Internet Explorer 9 Office 365 does not offer code fixes to resolve problems you encounter when using the service with Internet Explorer 9. You should expect the quality of the user experience to diminish over time, and that many new Office 365 experiences might not work at all.
- Internet Explorer 8 The user experience sending and receiving email with Outlook Web App and Internet Explorer 8 might be substantially diminished, especially when used on Windows XP or with low memory devices. Office 365 does not offer code fixes to resolve problems you encounter when using the service with Internet Explorer 8, and new Office 365 experiences might not work at all.
You should also expect the quality of the user experience with Internet Explorer 8 to diminish further in the near future. Beginning May 2014, Internet Explorer 8 now only displays Outlook Web App Light. If you are an Office 365 admin, you should have seen a notification of this change in the Message Center in the Office 365 admin center 30 days before the change took place.
If your organization is dependent upon Internet Explorer 8 to access older Web apps and services, you may want to consider upgrading to Internet Explorer 11 and evaluating Enterprise Mode for Internet Explorer 11. This update helps provide better backward compatibility for legacy Web apps.”
Web browsers: Firefox, Chrome, and Safari
Office 365 is designed to work with the current or immediately previous version of Firefox, or the latest version of Chrome or Safari. Microsoft supports only browser versions that are also supported by the browser’s manufacturer. Typically, this is only the most current version. Firefox and Chrome are both designed to stream updates your devices every six weeks. Many common problems with these browsers are resolved in the next update.
Office clients in mainstream support
Most Office 365 plans provide you with the latest versions of Office desktop applications, such as Word, Excel, and PowerPoint. To compare the availability of Office applications and features across Office 365 plans, see the Office Applications Service Description.
You can also use supported Microsoft Office clients with your Office 365 subscription. Office 365 is designed to work with any version of Microsoft Office that is in mainstream support. Although most new Office 365 experiences are designed for the latest version of Office, some new features might work with older versions of Office that are in mainstream support.
Office subscription software licenses (Office 365 ProPlus, Office Professional Plus 2010, and the Lync client provided with your Office 365 service) entitle you to use the current version of the software and do not include downgrade rights to older versions of the software. Microsoft may provide an upgrade period during which your subscription entitles you to use both a current and previous version of the software.
Note Mainstream support ends for Office Professional Plus 2010 on October 13, 2015.
Mainstream support ends for Office Professional Plus 2013 on April 10, 2018.
Office clients in extended support
Although Office clients in extended support were not designed to work with Office 365, they should continue to connect to the Office 365 service. Microsoft will provide a notice consistent with the Service Pack Support Lifecycle Policy if there is a substantial degradation of the user experience with an Office client that is in extended support or if that Office client no longer connects to the Office 365 service.
Office 365 Support provides assistance with older clients, offering workarounds or how-to information when possible. However, in many cases, the only solution Office 365 Support can offer for a problem with an older browser or client is to upgrade it.
Note Office 365 is not designed to work with Office 2007 because Office 2007 left mainstream support on October 12, 2012. Office 365 does not offer code fixes to resolve problems you encounter when using the service with Office 2007. You should expect the quality of the user experience to diminish over time, and many new Office 365 experiences will not work at all. We recommend that you upgrade as soon as possible to Office 365 ProPlus or Office Professional Plus 2013 for the best experience with Office 365.
Operating system requirements
Office 365 does not have an operating system requirement, except that the operating system you use must be supported by its manufacturer. However, there might be advanced Office 365 configuration options, features, scenarios, or tools that have explicit dependencies on an operating system or behave differently on different operating systems.
Note Windows XP left extended support on April 8, 2014. Although Office 365 will not block users from connecting to the service from Windows XP devices after this date, you should expect the user experience to diminish over time. Users with low-memory devices running Windows XP and Internet Explorer 8 will have a substantially diminished browser experience with Office 365.
Office Service Packs and public updates from Microsoft
The Microsoft Service Pack Support Lifecycle Policy requires you to install Office Service Packs within 12 months of its release. Office 365 requires you to be in compliance with this policy.
Automatic public updates contain critical security fixes for Microsoft products. Office 365 strongly recommends that customers accept automatic updates from Microsoft both to secure their environments and to have the best experience with Office 365. Office 365 ProPlus and Lync Basic users can only defer installing updates for 12 months from date of release.
System requirements across Office 365 plans
|Feature||Office 365 Small Business||Office 365 Small Business Premium||Office 365 Midsize Business||Office 365 Enterprise E1Office 365 Education A2Office 365 Government G1||Office 365 Enterprise E3Office 365 Education A3Office 365 Government G3||Office 365 Enterprise E4Office 365 Education A4Office 365 Government G4||Office 365 Enterprise K1Office 365 Government K1|
|Designed to work with Internet Explorer 11||Yes||Yes||Yes||Yes||Yes||Yes||Yes|
|Designed to work with Internet Explorer 10||Yes||Yes||Yes||Yes||Yes||Yes||Yes|
|Designed to work with Internet Explorer 9||No||No||No||No||No||No||No|
|Designed to work with Internet Explorer 8||No||No||No||No||No||No||No|
|Designed to work with the current or immediately previous version of Firefox||Yes||Yes||Yes||Yes||Yes||Yes||Yes|
|Designed to work with the latest version of Google Chrome||Yes||Yes||Yes||Yes||Yes||Yes||Yes|
|Designed to work with the latest version of Safari||Yes||Yes||Yes||Yes||Yes||Yes||Yes|
|Designed to work with Office 365 ProPlus||Yes||Yes||Yes||Yes||Yes||Yes||Yes|
|Designed to work with Office Professional Plus 2013||Yes||Yes||Yes||Yes||Yes||Yes||Yes|
|Designed to work with Office Professional Plus 2010||Yes||Yes||Yes||Yes||Yes||Yes||Yes|
|Designed to work with Office clients in extended support||No||No||No||No||No||No||No|
|Requires a specific operating system 1||No||No||No||No||No||No||No|
|Requires installation of Office Service Packs within 12 months of release||Yes||Yes||Yes||Yes||Yes||Yes||Yes|
1 Office 365 does not provide support for any operating system that is not supported by its manufacturer.
This information was taken directly from microsoft.com. Last updated April 24, 2014