Please add more backgrounds related to change of season or holidays, etc!! :)

Do not automatically enable all manner of spelling or grammar checking functionality when I have previously disabled all of that (cf. Microsoft Editor). It has no notion of jargon or mixed-language text, and is therefore frequently wrong, always unhelpful, and a massive eyesore to boot.

It would be great if we could use Microsoft To Do in ExpressRoute.

be able to pin "my day" view to all pages

1)Mail selected 2) Right clicked; menu appears.
3)Move selected> "Copy to a different folder " appears in Move menu.

When copy to a different folder selected, it is moved.

a bit weird.

When I log out via the Office365 landing page, I am not logged out of Outlook on the Web. (outlook.office.com) and re-open my session. Further, even if I log in via a different account in Office 365, when I open the outlook web app, I am still logged into my previous account.

When checking the permissions by Get-MailboxFolderPermission, we can check the delegate access permissions by Delegate, CanViewPrivateItems, but cannot check the permission type such as Delegate only and Send a copy.
Therefore, it would be great if you could enable us to check them as well.

We would like you to standardize the visibility of icons on the file which shared via a link of OneDrive and the one which shared with a copy of the link from Ootw. It’s the same file but one has a file icon and the other has cloud and file icon.

Both files are shared files from OneDrive, so we would like you to make them same icon (cloud icon).

It would be convenient if we could see the task which was moved to the In-Place Archive by using the retention tag in Ootw. I would request you to implement this feature in Ootw.

Although there is a different range of themes, it'd be nicer if there were more as some of them are distracting or too childish.

We would like to add a certain URL to resources in Exchange Admin center and show its content in Outlook client/Outlook on the web so that we can direct users to the specific resource information page.

I would like to have a more casual conversation starter. we have a lot of formal ones, but I would like them more causal

Allow admins to use PowerShell or Exchange Admin centre to change user settings in Outlook on the web.

For example, options for attaching group files from SharePoint or OneDrive for Business has default value of ”Ask me how I want to share them every time” but
there is no way for admins to change the default value to "Always share them as copies".

We would like to know the number of users who are currently using Ootw Light version. It would be great if you could add the feature to check it.

It says that this microsoft account doesn't exist when I try to transfer my Google Drive documents through "Download your data" Google Service. Fix this, I want to add the files to my OneDrive automatically

As we don’t want users to use Exchange Online with mobile devices, we have to disable mobile devices whenever adding users. So, we would like you to implement a feature that could change the initial setting of Outlook on the web for mobile as disabled so that we are able to manage users more convenient.

Currently, the full access for the shared mailbox is given to all users for our operational reasons.
Without removing the full access, it would be great if we could control meeting room bookings in the mailbox setting when the shared mailbox is an organizer.

Fix the grammar check. The word ACTUALLY is a clarifying word. Literally used to clarify. Your suggestions of "remove this word to clarify the statement" is the exact opposite of clarification.

All subfolders close down to the Inbox every time I sign out or close my browser. VERY INCONVENIENT. I have 35 folders and another 40 sub folders and sub-sub folders. I need to open up each one every time I sign in. No good. FYI: MS 365 is the ONLY webmail program I've ever used that does this. in fact, the Outlook Suite version installed on my laptop DOES REMEMBER folder tree settings. Please fix this. Thanks.