DO NOT OPEN CALENDAR, CONTACTS or TASKS in a new window!
Do not open calendar, contacts or tasks in a new window, or at least make that configurable!
If you're using a browser-app window (Chrome is capable of that) than you have an application window for Outlook 365, with Icon on the desktop and all, and you have no tabs in that window.
If the calendar and the others are opened in a new window, a new browser window with that tab opens and you loose the overview you have with that integrated browser-web-application.
So for now I am back to the old version due to this.

We’ve fixed this! Thanks for your feedback!
632 comments
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Anonymous commented
Where is the option for choosing new tabs or to stay on current tab?
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Graeme Klee commented
Fixed that one.. maybe. But the new connected account beta feature does the same thing. Each time you switch between accounts a new tab is opened. It's crazy. Hope it's fixed soon.
And there seems no way to remove the connected account - another bug most likely fixed soon as well one hopes.
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EdjeWie commented
Sorry, how did fix this? Is it now always in the same tab? I actually liked the bahavior of one tab per app. And with our current verison it doesn't open a new tab any more, in Chrome :-(
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Anonymous commented
The calendar has started opening in a new tab for me, but switching to the calendar view now takes as long as loading it in a whole new tab. With the old UI, switching to the calendar view was MUCH quicker. To make matters worse, even if I only glance at my calendar for a couple seconds, it now takes just as long to switch back to the mail view as it took to load the calendar, making this change even WORSE than opening the calendar in its own tab!
What a mess.
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Jake Li commented
Please stop to open new tab for calendar, or allow me to set its behavior. It is very annoy to open lot of calendar windows.
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Maksim Sizonenko commented
Finally, they fixed it. Hurrah!
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Sascha Pitz commented
Strangely, some accounts in our organization have fixed the problem and others are still opening new tabs.
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Anonymous commented
where was this fixed?
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Mark commented
The "old" web experience kept mail, calendar, contacts in the same tab and just switched the "view" when you clicked on each separate icon. MUCH better than opening a new tab/window every time you try to switch between Mail and Calendar. I'd describe in more detail but I have over 200 separate mail and calendar tabs open and my browser is barely functional.
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Mark commented
Arrrrggghhhh! Just when I had convinced users to stop using the bloated desktop client and use the web version of Outlook now you do this to me! I may go back to the bloated desktop client! Take that Microsoft and your trying to get people moved to your cloud services exclusively! What do I have to have 20 calendar tabs open since I get a new one every time I click the calendar icon???? Fix this PLEASE. PRETTY PLEASE!
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Micah MacDonald commented
Using Edge and still an issue. I was quite happy being able to check all of my outlook info in one tab. Opening a new one is quite frustrating
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James Phillips commented
As of 2019-09-10 in chromium this is not fixed or configurable.
I really hate this "feature."
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Bruce commented
Not fixed (and cannot flag the Admin's "COMPLETED" as inappropriate!) . . .
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Anonymous commented
It's been months since the new version and supposed fix came out. When will we have the option to have Reply and Forward open in a new window? Some of us prefer this and need it as an option. Thanks.
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Patrick Betts commented
This is still a problem for some users. This is not fixed as described by Admin.
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David Hamby commented
This is absolutely awful and needs to be a user option...
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Peter commented
This is still an issue. Opening the calendar in a separate tab is clunky and inefficient. It's also indicative of poor thinking on Microsoft's part. It bothers me greatly that they don't listen to their customers.
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MSL commented
This new upgrade on Office 365 is extremely frustrating. It's like we took 2 steps forward just to take 3 steps backward. Does this make any sense? I work in academia, specifically in the library as a librarian; and when I have library resources, webpages, websites, and emails opened, I simply do not need for my calendar to open in a separate window. Please, please, please, fix this issue and make our lives easier--not harder!
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zeev commented
Since upgrading to the new web version, clicking Mail and Calendar icons opens them in New Tab. It is better to open the same window as before.
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B commented
This was not fixed. For two weeks now every time I switch to calendar from mail the program opens in another window. This is so frustrating. You end up with 50 screens open!