Windows 8.1 and Windows RT include a built-in email app named Windows Mail. Mail includes support for IMAP and Exchange ActiveSync (EAS) accounts.
This article includes some key technical details of Windows Mail in Windows 8.1. (See Supporting Windows 8 Mail in your organization for Windows 8.0.) Use the information to help you support the use of Mail in your organization. Read this article start to finish, or jump to the topic that interests you. Use the reference links throughout the article for more information.
NOTE Mail, Calendar, and People apps run on Windows 8.1 and Windows RT. Although this article discusses the Mail app, please note that much of the information in this article also applies to the Calendar, and People apps. When connected to a server that supports Exchange ActiveSync, the Calendar, and People apps may also display data that was downloaded over the Exchange ActiveSync connection.
Mail lets users connect to any service provider that supports either of the following two protocols:
|Protocol versions & standards
Exchange ActiveSync (EAS)
IMAP + SMTP
Post Office Protocol (POP) is not supported.
NOTE All Windows Communications apps (Mail, Calendar, and People) can use the data that is synchronized using Exchange ActiveSync. After a user connects to their account in the Mail app, their contacts and calendar data is available in the other Windows Communications Apps and vice versa.
Mail can be configured to synchronize data at different times as follows:
If a push email connection can’t be established, it will automatically switch to poll at fixed intervals.
Push email requires that accounts are either Exchange ActiveSync (which all support Push) or IMAP with the IDLE extension. Not all IMAP servers support IDLE, and it is supported only for the Inbox folder.
When a push connection can’t be established, Mail will change to polling on 30 minute intervals. Push email on Exchange ActiveSync requires that HTTP connections must be maintained for up to 60 minutes, and IMAP IDLE requires TCP connections to be maintained for up to 30 minutes.
Windows 8.1 and Windows RT users can add email accounts to Mail using the Settings charm. The Settings charm is always available on the right side of the Windows 8.1 and Windows RT screen. (For more visual details about Charms & the Windows 8.1 user interface, see Search, share, print & more.)
NOTE This section provides an overview of account setup in Mail. For step-by-step procedures for setting up an account, see What else do I need to know? at the end of this guide.
To make it as easy as possible to add accounts, account setup only prompts the user to enter the email address and password for the account they want to set up. From that data, Mail attempts to automatically configure the account as follows:
If automatic configuration fails, the following additional information is required to connect to a server via Exchange ActiveSync:
The information required to connect to a server via IMAP/SMTP is:
Mail provides administrators with some level of security through Exchange ActiveSync policies (Mobile Device Mailbox Policies in Exchange 2013). It doesn’t support any means of managing or securing PCs that are connected via IMAP. EAS includes support for certificate-based authentication and remote wipe.
Exchange ActiveSync devices can be managed using Exchange ActiveSync policies. Mail supports the following EAS policies. :
Important If AllowNonProvisionableDevices is set to false in an EAS policy and the policy contains settings that are not part of this list, the device won’t be able to connect to the Exchange server.
Most of the policies listed above can be automatically enabled by Mail, but there are certain cases where the user has to take action first. These are:
If a Windows 8.x user uses a picture password and Exchange ActiveSync policy requires a password, the user will still need to create and enter a password in accordance with the policy.
If a Windows 8.1 PC is joined to an Active Directory domain and controlled by Group Policy, there may be conflicting policy settings between Group Policy and an Exchange ActiveSync policy. In the event of any conflict, the strictest rule in either policy takes precedence. The only exception is password complexity rules for domain accounts. Group policy rules for password complexity (length, expiry, history, number of complex characters) take precedence over Exchange ActiveSync policies – even if group policy rules for password complexity are less strict than Exchange ActiveSync rules, the domain account will be deemed in compliance with Exchange ActiveSync policy.
Communications applications can connect to a corporate Exchange service configured to require certificate-based authentication. User authentication certificates can be provisioned to Windows 8.1 devices by administrators or end-users can browse to certificate and install to user certificate storage.
User can add and connect an email account using a certificate. (For account setup, password entry is required per standard account setup.) User may be prompted to give the Mail application permission to access their user certificate, and should accept the prompt to enable certificate usage. In cases where multiple certificates are available, the user can go to account Settings to select the desired certificate.
Non-PIN protected software certificates are supported.
Mail supports the Exchange ActiveSync remote wipe directive, but unlike Windows Phone (which deletes all data on the device), Mail scopes the data deleted to the specified Exchange ActiveSync account for which the remote wipe command is issued. The user's personal data is not deleted. Additionally, attachments saved from that account are made inaccessible.
For example, if a user has an Outlook.com account for personal use and a Contoso.com account for work use, a remote wipe directive from the Contoso.com server would impact Windows 8.1 and Windows Phone 7 as follows:
|Windows Phone 7
|Windows 8.1 Mail
|Not deleted, but not accessible
|Other documents, files, pictures, etc.
To make it as easy as possible for users to have all of their accounts set up on all of their devices, Windows 8.1 uploads vital account information to the user’s Microsoft account. This information includes email address, server, server settings, and password. When a user signs into a new PC with their Microsoft account, their email accounts are automatically set up for them.
Passwords are not uploaded from a PC for any accounts which are controlled by any Exchange ActiveSync policies. Users will have to enter their password to begin syncing a policy-controlled account on a new PC.
If using client certificate authentication, the client certificate, and the certificate selection for an account will not be roamed. Users will have to select their desired client certificate to begin syncing a client certificate account on a new PC.
By default, users are required to have a Microsoft account, formerly known as Windows Live ID, to use the Windows Communications apps. This will usually be the Microsoft account that the user is signed into Windows with, but if they have not done so, they will be prompted to provide one before proceeding.
|If the Microsoft account is…
|Outlook.com or Hotmail account
|Automatically sync email, Calendar and Contacts using Exchange ActiveSync
|Not an Outlook.com or Hotmail account
(for example, firstname.lastname@example.org)
|Prompt the user to provide password for their email account
You can apply a Group Policy to a device to make a Microsoft Account optional for the Windows Communications apps.
Note, the Group Policy setting is configured in Computer Configuration node in the Group Policy and applies to all users of the computer/device to which it's applied. The policy setting lets you control whether Microsoft accounts are optional for Windows Store apps that require an account to sign in. This policy only affects Windows Store apps that support it. Windows RT devices can use Local Group Policy.
To apply the Group Policy setting:
If the Group Policy is applied and a Microsoft account is not used, the Communications apps will:
A user can add additional accounts if desired. You can use corporate firewalls or other mechanisms to block access to any consumer email services as needed.
The following functionality will be unavailable to a user without a Microsoft Account:
By default, Mail only downloads one month of email (up from 2 weeks in Windows 8.0). This is user configurable and can potentially download the user’s entire mailbox. For Exchange ActiveSync accounts, all contacts are downloaded and calendar events are downloaded only for three months behind the current date and 18 months ahead.
Additionally, messages can be only partially downloaded to reduce bandwidth use as follows:
|On unmetered networks
|On metered networks
|Truncated to the first 100KB or 20KB depending on folder and device conditions
|Truncated to the first 20KB. For more details see Engineering Windows 8 for mobile networks.
|Some attachments are downloaded automatically when device conditions allow.
Attachments for messages in junk folder are not downloaded automatically.
|Never downloaded automatically.
Embedded images in email messages are downloaded on-demand as the user reads them, and attachments which are not downloaded can be downloaded on-demand as the user attempts to open them.
Mail downloads all folders for an account. Users can configure the period of email which is downloaded to adjust the size of data for an account. Mail does not enforce any limits on number and size of attachments users can send.
Mail allows users to view and set their automatic reply messages (aka Out of Office or OOF messages). There is a visual indication when auto-reply is enabled. Users can view and set automatic reply plain text content. For corporate accounts, separate internal and external auto-reply messages are supported.
There is no date/time support for specifying start or end time for automatic replies.
The communications applications can connect over LAN or WiFi connections via authenticated proxies which use standard authentication methods including: NTLM, Digest, Negotiate, and Basic authentication.
Any user credentials entered can be cached for the session, or remembered persistently.
The communications applications warn the user with a prompt providing an option to connect anyway when trying to connect to services with common service certificate issues. See Self-Signed Certificates in Limitations below for details and recommendations.
The following features are currently not supported by Mail:
Direct mailbox connections using POP: Only EAS and IMAP protocols are supported.
Note This does not mean that Windows 8.1 does not support POP. This post is about the Mail app. See Using email accounts over POP on Windows 8.1 and Windows RT 8.1 for workarounds.
Opaque-Signed and Encrypted S/MIME messages When S/MIME messages are received in Mail, it displays an email item with a message body that begins with “This encrypted message can’t be displayed.”
To view email items in the S/MIME format, users must open the message using Outlook Web App, Microsoft Outlook, or another email program that supports S/MIME messages. For more information, see Opaque-Signed and Encrypted S/MIME Message on MSDN.
Users may experience connectivity errors when trying to connect to an Exchange server that uses a self-signed certificate or a certificate with other common issues. The user may receive the following error message.
There’s a problem with a server’s security certificate. It might not be safe to connect to the server because… <details>.
You can use one of the following options to resolve this issue.
|To resolve issue with self-signed certificates…
|Use this option if…
|Install a certificate signed by a trusted certification authority (CA) on the server
|Install the server’s self-signed certificate on the device
|Instruct users to ignore common certificate issues
At the prompt, users can connect anyway to ignore common service certificate issues such as self-signed certificates, allowing the communications applications to use an encrypted connection to the email service with the certificate issue. If users choose to connect anyway and ignore the service certificate issues, their selection will be remembered, (can be viewed and changed any time via Settings for account).
We recommend that users select Cancel when they receive a certificate-related error and contact the administrator to fix the issue (option 1).
See Digital Certificates and SSL for more information.
This enables Exchange to work for Windows 8.1 devices that have the certificate installed.
Note The administrator must provide a certificate file (.cer). The certificate can be installed to the trusted root certificate authority store for either of the following options:
The user or the system administrator can use the .cer file to install the certificate. To do this, use one of the following methods:
At an elevated command prompt, run the following command:
certutil.exe -f -addstore root.cer
NOTE The command installs the certificate for all users on the device.
If a Mail user can't successfully connect to an account, consider the following:
TIP The user will see the following message if they haven't registered their account: “We couldn’t find the settings for. Provide us with more info and we’ll try connecting again.”
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