Adding More Than 10 Exchange Accounts

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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.


“Multiple Exchange accounts limit”

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