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On Oct 5, the day after updating my laptop to Big sure, my attempt to install MSO 2021 Home and Student (standalone version) on MBPro 2017 resulted in a chaotic fail.
After the purchase the initial attempt to install was met with an alert
something to the effect "not compatible with your operating system"

Initially I cancelled the install. But then decided to try again, or at least confirm what the issue was.
After navigating to my MS account I noticed a number of anomalies for this current purchase:
• Key already in use
• Install link had disappeared from my purchases queue

A couple hour call to MS Customer Support resulted in wide array of conflicting information
and mixed messages: One rep said this was a Known Issue, then said MSO2021 for Mac would be available next month, then said install is compatible with Big Sur, and then said installation on Big Sur requires Microsoft Advanced Tech Team Support >>> Requested and received a refund.
Support never answered my query on why the download link disappeared from my purchase queue, even after confirming the purchase

Seems there would be more discussion on this anomaly. Haven't seen any at Apple, or at other Mac-centric boards
 
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The download link on your MS account page should still work.

After you have tried to download Office 2021 by using the link on the purchase page - where you got the windows version offered - then this link got “already used”.

And yes - the support from MS was very bad, no one know what they were doing.
 
The download link on your MS account page should still work.

After you have tried to download Office 2021 by using the link on the purchase page - where you got the windows version offered - then this link got “already used”.

And yes - the support from MS was very bad, no one know what they were doing.
Sort of a moot point now since I requested a refund due to the lack of effective support, and immanent complexities involved.
I purchased MSO 2021 from this digital product page

After navigating to my confirmation email the first install attempt failed due to the "not compatible" alert.
I believe the purchase page would have detected which version I was purchasing
The notation displayed the following, with no option to select an operating system.
Office Home & Student 2021
Microsoft Corporation‬
For 1 PC or Mac
For 1 person
• One-time purchase for 1 PC or Mac • Classic 2021 versions of Word, Excel, and PowerPoint

Resulting attempts to install resulted in discovering that the purchase of the 2021 version and the actual download icon disappeared.

It is still unclear at this point whether 2021 is compatible with Big Sur
their system spec reads thus:

Operating systemWindows 11 or Windows 10 for PC; Mac OS for Mac
 
Sort of a moot point now since I requested a refund due to the lack of effective support, and immanent complexities involved.
I purchased MSO 2021 from this digital product page

After navigating to my confirmation email the first install attempt failed due to the "not compatible" alert.
I believe the purchase page would have detected which version I was purchasing
The notation displayed the following, with no option to select an operating system.
Office Home & Student 2021
Microsoft Corporation‬
For 1 PC or Mac
For 1 person
• One-time purchase for 1 PC or Mac • Classic 2021 versions of Word, Excel, and PowerPoint

Resulting attempts to install resulted in discovering that the purchase of the 2021 version and the actual download icon disappeared.

It is still unclear at this point whether 2021 is compatible with Big Sur
their system spec reads thus:

Operating systemWindows 11 or Windows 10 for PC; Mac OS for Mac
For now Office 2019 and 2021 is the same installer - and the same applications - it will only be the license that you can see that has been updated.

On the MS Office's update page where you can download the full installer - https://docs.microsoft.com/en-us/officeupdates/update-history-office-for-mac - it also show as "Microsoft 365, 2019, 2021" - the Office 2021 with the new updates, is the subscription version.
 
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For now Office 2019 and 2021 is the same installer - and the same applications - it will only be the license that you can see that has been updated.

On the MS Office's update page where you can download the full installer - https://docs.microsoft.com/en-us/officeupdates/update-history-office-for-mac - it also show as "Microsoft 365, 2019, 2021" - the Office 2021 with the new updates, is the subscription version.
Thanks for that update. It is interesting to me that this information contained on the page is mainly for IT professionals, and that details on purchasing, license updates, and such, are not provided to the general public, so to speak, in a clear manner when purchasing the software.
On some level it appears the implication here is , for instance, a possible work around for my original problems is to
• download the full office suite package without teams,
• then purchase the Office Home and Student 2021 from the online store,
• install from the downloaded installer and employ the new license key .... perhaps?

Or, I could reinstall from my 2019 purchase link that populates my purchase queue, and enter the new key perhaps
 
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"New" Outlook still can't flag an email for followup at a certain date. One of the best features of Outlook. Hope that makes it into the "2021" version...
 
Thanks for that update. It is interesting to me that this information contained on the page is mainly for IT professionals, and that details on purchasing, license updates, and such, are not provided to the general public, so to speak, in a clear manner when purchasing the software.
On some level it appears the implication here is , for instance, a possible work around for my original problems is to
• download the full office suite package without teams,
• then purchase the Office Home and Student 2021 from the online store,
• install from the downloaded installer and employ the new license key .... perhaps?

Or, I could reinstall from my 2019 purchase link that populates my purchase queue, and enter the new key perhaps

Ya I get the feeling that the Microsoft for Mac team is doing its own thing, but got roped into the "Microsoft 2021 for all platforms" plan. So for now it seems like they are just giving people the Office 365 version with the 2021 licesnse. I assume that will stop at some point.

Anyway, I purchased a Office 2021 license from Amazon. Added the license to my Microsoft Account. Downloaded the latest Office installer from the website linked by rlarsen_eu. No problems with the activation of Office on a new computer.

Edit: And yes I know your post is over a month old now. Mainly adding my recent experience for anyone else who is still trying to figure out what is going on with this.
 
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Hi, please let me know the installed app sizes of office 2021, if possible from 16.77. Thanks
 
Hi, please let me know the installed app sizes of office 2021, if possible from 16.77. Thanks
Excel: 2.1 GB
Word: 2.3 6GB
PowerPoint: 1.81 GB

All of these sizes are version 16.77. Curious why you want to know the sizes of each app?

I hope this helps.
 
Hi, please let me know the installed app sizes of office 2021, if possible from 16.77. Thanks
Here are my Microsoft apps, all updated to the current stable releases. The Office apps (Excel, OneNote, Outlook, PowerPoint, and Word) are all 16.77. I have these from an Office 365 subscription, rather than the one-time Office 2021 purchase; but since v. 16.77 is available to you with Office 2021, they're probably the same.

1694667334101.png
 
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I have onetime 2021 and my file sizes are:
Word 2,51GB
Excel 2,2 GB
Powerpoint 1,89 GB
OneNote 1,2 GB
Outlook 2,35 GB

When updating to 16.77 the small upgrade was loaded but not installed and after next try the whole .app was loaded again by the Microsoft Autoupdater. Thats why i‘m asking if possibly sth went wrong at my install..
Someone else with different file sizes?
Macbookair M1..

Thanks
 
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