A very useful addition to the SharePoint Migration Tool from Microsoft would be support for SharePoint Online to SharePoint Online migrations. There are many scenarios where this is commonly needed for some customers who must restructure or realign and be able to migrate from one area of SharePoint Online to another. Just in general as well this would be a handy option to have.

Could this please be considered as a future improvement to the SharePoint Migration Tool including support with bulk migrations for SharePoint Online as a source. Thanks.

Currently, custom properties from an on-prem farm, like site columns in a site, are only visible to the search service account in O365. Global admins, SharePoint admins, cannot see these properties and cannot access them until they are added to managed properties.

When I access site collection which is deleted from SharePoing admin center ,the message of [You need a pemission to access the site] displayed . Because the site has been deleted , I think the message is not appropriate .I hope that [404 FILE NOT FOUND] can be showed .

Allow ADFS users to search on premise on their Online AND Onpremise content. ADFS is the only way to provide SSO between Online and OnPremise environment but cannot be used because of the ACL mapping in the Cloud SSA when returning results OnPremise.

Bring back mail enabled document libraries in SharePoint what a pain it was to setup a flow to do the same thing :-(

Allow structural navigation to work properly so I don't have to create an entire term store to do navigation

Adding Balsamiq Mockups MIME type (BMPR) MIME type in SharePoint online

In SharePoint online it would be very helpful to also have host named site collections. We use this to logicall sign and separate our URL's like for departments or business units.
E.g. https://it.mycompany.sharepoint.com and https://hr.mycompany.sharepoint.com

Can we please get support for on-prem content enrichment as part of the Cloud Hybrid Search service?
Otherwise we're stuck with Federated search, which is far from optimal in terms of user experience.

In SharePoint online it would be very helpful to have also the possibility to create managed paths like /projects or /departments.

As is, the profile picture displayed in SharePoint Online contents to mirrors the availability status of the user with a mark, but does not connect with Skype for Business or Exchange Online.
I would like for you to change this, so that SharePoint Online contents also gets interlinked with the availability status of Skype for Business and / or Exchange Online.

Crawled properties from on-premises farms should be added to O365 in Hybrid search (cloud index) scenario.

As described here: https://blogs.msdn.microsoft.com/ronalg/2016/11/21/hybrid-search-and-search-popularity-trend-reports/ Popularity Trend Reports are not available in hybrid scenarios as "the view events are not passed on to the search farm that is in the cloud". Include this functionality or provide an alternative in a future release

Have the crawl engine add the basic metadata of the file to the index before crawling the internals of the file. We have files that get the 759 timeout crawler error. These files are "invisible" to search and the user can no longer find the files. The problem is also with SharePoint Online but to a lesser extent since there's more horsepower on the SPO crawl engine. Or have a "clean up" crawl that just adds the basic metadata of the files with 759 timeouts to the index.

When a Markdown file (*.md) is stored in a document library, it would be great if the default behavior when opening the link was to display it in a new page with the HTML view of the Markdown syntax. Team
Foundation Server 2017 does this in it's web view. Currently SharePoint Online opens the file as a text file. Sort of can't believe that this wasn't already an idea in this UserVoice site...