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Hi,<br />
<br />
Please check this link.<br />
<br />
<a href="http://technet.microsoft.com/en-us/library/hh852522.aspx" rel="ugc">http://technet.microsoft.com/en-us/library/hh852522.aspx</a>
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Hi,

Please check this link.

http://technet.microsoft.com/en-us/library/hh852522.aspx [http://technet.microsoft.com/en-us/library/hh852522.aspx]

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<div class="content wysiwyg-content">
Hi, <br />
<br />
We use O365 and Outlook 2010.<br />
<br />
Can someone let me know what communication protocol between them? &nbsp;I know SMTP is not being used.<br />
<br />
When we use Outlook 2010 and on-prem Exchange 2010, IMAP was used. &nbsp;<br />
<br />
Thanks.
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Hi, 

We use O365 and Outlook 2010.

Can someone let me know what communication protocol between them?  I know SMTP is not being used.

When we use Outlook 2010 and on-prem Exchange 2010, IMAP was used.  

Thanks.

O365 and Outlook 2010 communication protocol.

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

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

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.