Office 365 - Which clients/protocols will be supported?

"Office 365" refers to subscription plans that include access to Office applications plus other productivity services that are enabled over the Internet (cloud services). By default, all UW-Madison Office 365 users have access to email, calendar, and people. You can use many different clients to connect (via an email protocol) to your Office 365 account.

What is a client?

A client is an application that is used to connect to your Office 365 account. Some examples include Microsoft Outlook or Internet Explorer/Google Chrome.

What is an email protocol?

Email protocol is a method by which a communication channel is established between two computers and email (some protocols also include calendar data) is transferred between them. When an email is transferred, a mail server and two computers are involved. One computer sends the mail and the other one receives it. The mail server stores the mail and lets the receiving device access it and download it if needed.

What clients/protocols are supported by Office 365 Team?

Even though Microsoft provides you with the ability to connect to your Office 365 account using a wide variety of clients/protocols, for the best experience and complete support, Microsoft recommends connecting through one of the following ways:

Note: IMAP/POP3 connections are enabled by default, however, Office 365 is an Exchange service meaning that clients which connect using POP3 or IMAP protocols will have limited functionality/features.

Enable/Disable Protocol

By default, all protocols are enabled. If you would like to disable a protocol, use the following steps:

  1. Log into Wisc Account Administration site.
  2. Select the account you want to manage.
  3. Click on the "Office 365" tab in the left-hand column. It will be expanded.
  4. Click Client Protocols.
  5. Within the 'Client Protocols' screen:
    client protocols - enable or disable
    Click on the desired action next to the protocol you want to manage.

Note: If a protocol is disabled, the account cannot be used to connect to Office 365 via that protocol. For example, if you only want a student to use Outlook on the web and Outlook 2016, OWA and MAPI are the only protocols that need to be enabled.

What happens if a protocol is disabled?

If a protocol is disabled for an account, any client that attempts to connect via the disabled protocol to your Office 365 account will be unable to connect (some type of connection error). Below is a list of errors you may receive:

  • Outlook on the web - browsers: "Something went wrong - The mailbox being access not have a valid account state ('ProtocolDisabled')"
  • Outlook desktop: You may receive an encryption or connection error.
  • Outlook for Android: You will receive a connection error.
  • Outlook for iOS: You will receive a connection error.
  • ActiveSync - native mobile mail/calendar clients: unable to verify account.
  • EWS applications - used by developers via API code: unable to connect or verify account.
  • IMAP - any mail client: unable to connect or verify account, or repeatedly prompted for account credentials.
  • POP - any mail client: unable to connect or verify account, or repeatedly prompted for account credentials.
  • UW SMTP Auth - sending mail via any client/process: error attempting to connect or unable to send message.

Reasons for Disabling a Protocol

You might want to consider disabling a protocol for the following reasons:
  • Messages deleted via POP and IMAP bypass the Deleted Items folder and cannot be recovered
  • Departmental policy mandating that only certain protocols be used for security and/or compliance reasons
  • Principle of least privilege: by enabling only the protocols that you use to access your account, there is reduced risk of undesired access

See Also:

Keywords:microsoft office 365 office365 o365 email calendaring owa mapi eas ews imap pop3 smthauth smtp auth activesync caldav carddav prtcls standards exchange browsers mozilla firefox google chrome ie internet explorer apple safari web app services mobile windows macintosh devices linux unix outlook on the web app owa something went wrong the mailbox being accessed not have a valid account state protocol disabled   Doc ID:28747
Owner:Ara M.Group:Office 365
Created:2013-02-22 11:47 CDTUpdated:2018-04-04 09:09 CDT
Sites:DoIT Help Desk, DoIT Help Desk Training, DoIT Tech Store, Office 365, Wisc Account Admin
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