So, you have two (or more) domains associated with your Office 365 Exchange account. When you try to create a shared mailbox on one domain, you encounter an error stating: ‘The proxy address “SMTP:[email protected]” is already being used by the proxy addresses or LegacyExchangeDN. Please choose another proxy address.’ I may have just the fix for you!
Hi! I’m Aiden, also known as Logi. I’m an IT Tech with big dreams, a fire performer with big ideas and a tinker with little… Read More »Where to start? How about an introduction