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From this page:<br />
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<a href="https://products.office.com/en-us/office-system-requirements" rel="ugc">https://products.office.com/en-us/office-system-requirements</a><br />
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it says:<br />
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Office 365 works with any version of Office in mainstream support: the latest version of Office, Office 2013, and Office 2011 for Mac. Previous versions of Office clients, in extended support, may work with Office 365 with reduced functionality.<br />
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anyone know what you lose? &nbsp;I didn't find a page that defines what is reduced.
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From this page:

https://products.office.com/en-us/office-system-requirements

it says:

Office 365 works with any version of Office in mainstream support: the latest version of Office, Office 2013, and Office 2011 for Mac. Previous versions of Office clients, in extended support, may work with Office 365 with reduced functionality.

anyone know what you lose?  I didn't find a page that defines what is reduced.

So what do you lose with outlook 2010, 2007 etc and office 365

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.

Microsoft 365

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.

Microsoft Office

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).