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User has iPhone, iPad and Dell Windows 10 with Outlook 2016.<br />
The three devices are not synchronizing deleted emails properly.<br />
They have Comcast email which shows IMAP setup on all three devices.<br />
<br />
If they delete from iPad, message is removed from Outlook but not iPhone<br />
If they delete from iPhone, message is removed from Outlook but not iPad<br />
If they delete from Outlook, message is not removed from either iPhone or iPad<br />
<br />
What should I check? &nbsp; Thanks.
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User has iPhone, iPad and Dell Windows 10 with Outlook 2016.
The three devices are not synchronizing deleted emails properly.
They have Comcast email which shows IMAP setup on all three devices.

If they delete from iPad, message is removed from Outlook but not iPhone
If they delete from iPhone, message is removed from Outlook but not iPad
If they delete from Outlook, message is not removed from either iPhone or iPad

What should I check?   Thanks.

iPhone iPad and Windows Outlook 2016 do not synch deleted email

iPad is an iOS-based line of tablet computers built around the device's multi-touch screen, including a virtual keyboard. The iPad includes built-in Wi-Fi and cellular connectivity on select models. An iPad can shoot video, take photos, play music, and perform Internet functions such as web-browsing and emailing. Other functions – games, reference, GPS navigation, social networking, etc. – can be enabled by downloading and installing apps.

iPad

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.

iPhone

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

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.