Outlook Express 365

Posted : admin | On 01-05-2021

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Posted on Tuesday, June 16th, 2020 at 4:34 am by Andrei Smolin.

This blog is about how these products support Office 2019 and Office 365:

Add-in Express for Office and .NET
Add-in Express for Office and VCL
Add-in Express Outlook Regions for VSTO
Security Manager for Outlook

You might already know that Office 365 and Office 2019 are, in fact, subsequent builds of Office 2016: in any Office 365 and Office 2019 application, the Application.Version property returns a string that starts with “16”.

This means Add-in Express products supporting Office 2016 also work in Office 365 and Office 2019. Though, there are several details to take notice of.

Office 2019 and Office 365

Outlook Express Office 365 Settings

Microsoft uses “Office 2019″ for Office products that you buy as a one-time purchase, which means you pay a single, up-front cost to get Office apps for one computer. One-time purchases are available for both PCs and Macs. However, there are no upgrade options which means if you plan to upgrade to the next major release, you’ll have to buy it at full price (citation from support.office.com). As Office developers, you may run into a retail version of Office 2019 installed on the end-user’s machine and left non-updated. Be aware that that version may cause problems, so request the customer to update their Office version. The same applies to the initial retail version of Office 2016.

“Office 365″ represents the “software as service” approach: Office 365 applications are delivered and updated online via Click-to-Run. On this page at support.office.com they say that Office 365 is a subscription service.

Office 365 Insider (or Beta) channel

There are a few Office 365 update channels, each providing new builds at different update intervals. Different stability levels are assumed.

Insider is one of such update channels: it updates as often as 1-2 times a week. Every update is in fact a beta. To get a hand on the pulse, our testing team regularly run tests on the Beta channel builds.

Still, reacting to a change (once it is detected) may require some efforts from us and this will take some time. Also, Microsoft may introduce bugs with each update. And they did introduce bugs, quite rarely though. It also takes time for them to recognize the issue and fix it.

This means that Office 365 builds obtained through the Insider/Beta channel may not be supported immediately upon release. Using a non-tested beta build may break the add-in or even the add-in’s host application itself. We don’t recommend that your customers use the Insider channel.

Office from Microsoft Store

This is another flavor of Office. Because it works in a way that conflicts with per-user Office add-ins, only per-machine add-ins are supported. Find our research result in Office from Microsoft Store: a spreading source of issues. It looks like Microsoft has recognized the problem and we meet Office from Store on more and more rare occasions.