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Had to remove the user profile and recreate a new one which resolved the issue.
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I have just upgraded a client to Windows 10 and her Mail isn't working correctly. &nbsp;<br />
It's not syncing all of the time which means that some new emails aren't arriving and all sent emails are not appearing within the sent items folder.<br />
<br />
I have removed the email account and recreated it to see if that made a different which it hasn't done.<br />
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This use to work fine within Windows 8.1.
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I have just upgraded a client to Windows 10 and her Mail isn't working correctly.  
It's not syncing all of the time which means that some new emails aren't arriving and all sent emails are not appearing within the sent items folder.

I have removed the email account and recreated it to see if that made a different which it hasn't done.

This use to work fine within Windows 8.1.

Windows 10 Mail

An email client, email reader or more formally mail user agent (MUA) is a computer program used to access and manage a user's email. A web application that provides message management, composition, and reception functions is sometimes also considered an email client, but more commonly referred to as webmail.

Email Software

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

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.