Microsoft Support and Recovery Assistant

 

Microsoft Support and recovery assistant is a nice tool to help with Office applications, Microsoft 365, and Outlook issues.

Its a nice first step if you are having an issue with a device or an account.

https://support.microsoft.com/en-us/office/about-the-microsoft-support-and-recovery-assistant-e90bb691-c2a7-4697-a94f-88836856c72f

Recommend Steps for Deleting Microsoft 365 User

1. Confirm OneDrive retention is right for the company at default its 30 days
   https://docs.microsoft.com/en-us/onedrive/set-retention
2. Decide who is getting access to the users OneDrive and emails
3. Depending on if the account is AD synced or Cloud only do one of the following
1. AD Sync
1. Delete user in AD and force a delta
2. Confirm user has been related out of Microsoft 365
3. Restore user in 365 and reassign its license.
   
   It will now be a cloud only account with no sync back to On-Prem, form here can follow cloud only
2. Cloud Only
1. Select user in Active users and delete (Follow recommend flow)
2. Give access to users OneDrive as needed
3. Give Access to users Emails as needed
   
   If you are doing this from a recently broken synced account it may take a few minutes and a page refresh for the right options to appear in delete options.
   https://docs.microsoft.com/en-us/microsoft-365/admin/add-users/delete-a-user?view=o365-worldwide 

This is a secure and clean way to handle user deletion while keeping on-prem AD clean while also fixing an issue with hybrid exchange set ups / migrations which can result in shared mailboxes getting deleted from Microsoft 365 if they once where a private mailbox moved from on-prem exchange 

Convert a user mailbox to a shared mailbox

https://docs.microsoft.com/en-us/microsoft-365/admin/email/convert-user-mailbox-to-shared-mailbox?view=o365-worldwide

Side note

Quick consideration when converting to a shared mailbox,  this can be done to free up the license as long as the mailbox is under 50GB, any larger and it will still need a license.

Search for OneDrive files that have been cached on local device

1. Install Everything Search by Voidtools
   https://www.voidtools.com/
2. Set Everything to index attributes by going too Tools > Options > Indexes
3. Put the folder location in to the search bar using " quotations and then put the following at the end " !attrib:d !attrib:h !attrib:o"

This is based off testing but files with the P and O attribute appear to always be available online only, while files without always appear to be available offline.

Reset OneDrive desktop sync app

1.  Run the Following

%localappdata%\Microsoft\OneDrive\onedrive.exe /reset

If you get an error try this

C:\Program Files (x86)\Microsoft OneDrive\onedrive.exe /reset

2. Restart OneDrive

https://support.microsoft.com/en-us/office/reset-onedrive-34701e00-bf7b-42db-b960-84905399050c

M365 SharePoint OneDrive considerations

When you are setting up your M365 SharePoint sites and looking at the Document Libraries,  one of the things you will need to think about is are you going to allow OneDrive to sync it.

If so there are somethings you need to plan and think about if you do.  the first being that if a single Library is over 100K files this will greatly impact performance on OneDrive (and is also not recommended) and if the Total number of Libraries synced to the client is over 300K files again it will massively impact performance.

OneDrive Sync is there for offline file access not a replacement for a servers file share if you do wish to use it like this, do so via the Web interface with Office hooked in to it will give better mileage.

For the libraries that you allow to be cached offline keep them below 100K files and use non offline libraries for most of you data.

Also  even if you just sync a folder within the Library it does not matter the whole Library is taken in to account when syncing.

https://docs.microsoft.com/en-us/office365/servicedescriptions/sharepoint-online-service-description/sharepoint-online-limits

Microsoft 365 OneDrive default retention for deleted users

Microsoft 365 OneDrive has a default retention of 30 days for users that have been marked for deletion but this can be changed to up to 10 years from the OneDrive admin panel.

https://admin.onedrive.com/

This can also be found by logging in to www.office.com with an account that can access and change these settings. and going too "Admin" and then "All Admin Centres" and selecting "OneDrive", or by going to the SharePoint admin.

https://docs.microsoft.com/en-us/onedrive/set-retention