Adding More Than 10 Exchange Accounts

Description:

So I ran into an issue during a conversion process moving some clients to Exchange where it would throw an error saying “too many Exchange accounts already exist; Please add the account as POP/IMAP”. Upon looking it up, I found that it is supposed to do this after 10, but it was doing this sometimes while adding the second account!

To Resolve:

1. Run => regedit

2. Navigate to: HKEY_CURRENT_USER\Software\Microsoft\Exchange

3. Create a new entry called:

   DWORD: MaxNumExchange
   Outlook 2010 values: a number between 1 and 15
   Outlook 2013 values: a number between 1 and 9999
   Outlook 2016 values: a number between 1 and 9999 # I usually just set this to 20.
   

4. Try adding the account again.

References:

“Multiple Exchange accounts limit”