Forum Discussion
Send on Behalf not working in specific situation
In the second scenario, Outlook is effectively using Send As permissions, so just add those and be done with it 🙂 If you insist on using Send on behalf of, you need to make sure to always select the "send using" dropdown, as detailed in the article linked above.
Remco_Tiel Hi, you're doing it manually? You really benefit by using PowerShell
https://docs.microsoft.com/en-us/powershell/module/exchange/add-mailboxpermission?view=exchange-ps with the -AutoMapping switch.
To answer your question https://docs.microsoft.com/en-us/exchange/collaboration/shared-mailboxes/shared-mailboxes?view=exchserver-2019#what-are-shared-mailboxes
To control cache of shared mail folders
https://support.microsoft.com/en-us/help/982697/by-default-shared-mail-folders-are-downloaded-in-cached-mode-in-outloo
Thnx for your reply. I've tested the automapping, which works, however automapping is adding the shared mailbox to your own profile (pst) instead of creating a seperat pst file.
Remco_Tiel You mean the .ost I assume. You can use the registry setting if applicable.
I found these on the topic
https://www.michev.info/Blog/Post/2025/how-to-add-a-shared-mailbox-as-additional-account-in-outlook-2016-build-8431-and-above-on-windows-10-1709-and-above
https://www.techpros.com.au/office-365-automapping-performance-issues/