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Is this the Outlook app or the Outlook desktop client?
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Is this the Outlook app or the Outlook desktop client?

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In resonse to Vasil, it is the web client. &nbsp;in order to access it, I have to logon on to Microsoft Edge and then login to my portal. office.com account, and then all the apps show up, and one of them is the Mail, which is outlook. &nbsp;hope this makes sense. &nbsp;sorry for being novice.
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In resonse to Vasil, it is the web client.  in order to access it, I have to logon on to Microsoft Edge and then login to my portal. office.com account, and then all the apps show up, and one of them is the Mail, which is outlook.  hope this makes sense.  sorry for being novice.

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In response to Vasil, thank u I found it, it was under Options, Accounts, connected accounts. &nbsp;And under this I saw &quot;Change default reply address&quot;, and that is where I changed it. &nbsp;Thank u for all your assistance. Regards.
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In response to Vasil, thank u I found it, it was under Options, Accounts, connected accounts.  And under this I saw "Change default reply address", and that is where I changed it.  Thank u for all your assistance. Regards.

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You're welcome. Dont forget to mark an answer so others can benefit from your pain :)
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You're welcome. Dont forget to mark an answer so others can benefit from your pain :)

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My OS is win 10 pro and I have a Business essential account for office 365. &nbsp;Whenever I open Outlook thru the default company account, the email client also displays my other email account, which is msn. &nbsp;But whenever I want to send out, it defaults to the company email as the default &quot;From&quot; to use. &nbsp;<br />
How do I select this to be the msn account. &nbsp;At present I have to manually do it. &nbsp;But sometimes when in a haste, I forget to select the msn email account. &nbsp;Thank u.
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My OS is win 10 pro and I have a Business essential account for office 365.  Whenever I open Outlook thru the default company account, the email client also displays my other email account, which is msn.  But whenever I want to send out, it defaults to the company email as the default "From" to use.  
How do I select this to be the msn account.  At present I have to manually do it.  But sometimes when in a haste, I forget to select the msn email account.  Thank u.

Office 365

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

An office suite is a collection of bundled productivity software (a software suite) intended to be used by knowledge workers. The components are generally distributed together, have a consistent user interface and usually can interact with each other, sometimes in ways that the operating system would not normally allow. Most contain a word processor, a spreadsheet, an email client and presentation software; some might contain a database program. Several office suites have their own topics: Microsoft Office, Office 365, LibreOffice (also known as OpenOffice), Lotus IBM and Google Apps.

Office Suites-Other

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

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

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.