Using older versions of Outlook for Mac in business environments
Dear Chamara Thennakoon,
Good day!
Thank you for posting to Microsoft Community. We are glad to assist!
Based on your description regarding "Didn't work callback function after sending mail in iOS". Yes, I have gone through your scenario, and I would like to share some information with you. For Outlook for iOS, we have a dedicated team with special expertise in Outlook for iOS queries, so we sincerely recommend you to kindly contact our dedicated Outlook for iOS support channel via Get in-app help for Outlook for iOS and Android - Microsoft Support Engineers who are dedicated into Outlook for iOS with rich experience and more resources can then assist efficiently. We believe they would conduct in-depth research on the problem you encountered and provide you with more professional assistance.
Thanks for your understanding! Your patience and cooperation will be highly appreciated. Have a nice day!
Best regards,
Inema | Microsoft Community Moderator