Beginning with Microsoft Outlook 2010, you can open more than one Exchange account in your Outlook profile.
So how many Exchange Accounts can you add to an Outlook 2010 or Outlook 2013 profile?
In Microsoft Outlook 2013 and 2016, the default is 10 accounts and the maximum allowed is 9999 accounts. Outlook 2010 supports up to 15 accounts in your profiles, but, by default it is limited to 5 accounts.
If the administrator wants to allow more (or less) than the default number of accounts, he or she needs to edit the registry or apply a group policy.
The relevant Group Policy key for all supported versions of Outlook is:
HKEY_CURRENT_USER\Software\Policies\Microsoft\Exchange
DWORD: MaxNumExchange
Outlook 2010 values: a decimal value between 1 and 15
Outlook 2013 values: a decimal value between 1 and 9999
Outlook 2016 values: a decimal value between 1 and 9999
In the Group policy editor, the setting is under Outlook > Account Settings > Exchange > Set maximum number of accounts per profile.
If you prefer not to add it as a policy, use these keys instead. Note: if you are using the consumer or Business version of Outlook 2013 and newer, you may need to use these keys instead.
HKEY_CURRENT_USER\Software\Microsoft\Exchange
DWORD: MaxNumExchange
Outlook 2010 values: a decimal value between 1 and 15
Outlook 2013 values: a decimal value between 1 and 9999
Outlook 2016 values: a decimal value between 1 and 9999
The new setting won't take affect until you restart Outlook.
Do it for me
This registry file will set a Policy key to allow up to 15 Exchange accounts; works with Outlook 2010, 2013, or 2016. (In HKCU\Software\Policies\*)
15 accounts
To set the registry key to allow 15 accounts, use this registry file. This works with Outlook 2010, 2013, or 2016. (In HKCU\Software\Microsoft\*)
15 Accounts, user keys
I have added 8 email ids in single profile. However, i am facing deadlock issues with office 365 2016 x61 business version.
They are all exchange? Are they all to the same server?
Updated the 64-bit key and still didn't work.
Did you use the user key or the policies key? Did you restart Outlook?
i'm using the 64-bit version. Is that why this isn't working for me?
Nah, version doesn't matter - its a generic key for both versions. Did you see https://support.microsoft.com/en-us/help/3101356/the-value-of-the-maxnumexchange-registry-key-doesn-t-work-for-exchange ?
Actually, never mind on that KB - you should have those updates installed since you use an E3.
Thank you for this, it has been very useful.
fyi the second option you provide under 'do it for me' is a registry file that allows 21 accounts, I believe the error is that you have entered 15 as the hexidecimal value, which, converted to decimal, is 21. At least I think that's the case-- I'm a newbie to this.
Correct, i realized it after i saved it and kept forgetting to fix it - figured it was better to be high than low. :)
This worked great for Windows but I cant find anywhere on if this is possible to do for MAC. I just bought a new MacBook Pro and would like to add all my exchange and Outlook accounts but I get stuck after the 5 one. I have researched everywhere and cant find anything on this for the MAC.
I will ask about it.
Just to check. how can we limit exchange mail box creation limit to 2 ? is it possible .
Example.-
How can we restrict users from creating corporate email account in their personal laptops. can we disable or limit to 1 per user ID ?
You can control it in computers covered by corporate policy but it's a policy setting, not a mailbox setting, AFAIK you can't control it on user-owned computers. I hav looked at mobile device policies but I'm pretty sure they only apply to small devices, not laptops and home computers.
You can turn off remote access and force everyone to use OWA, but that can be less productive in the long run.
Hi,
You explain that one can have several Exchange accounts in an Outlook profile.
However, https://support.microsoft.com/en-us/kb/291626 "How to manage multiple Exchange mailbox accounts in Outlook" states that “you can only have one service in your Exchange Server profile”.
So, what is the difference between the two ?
Does it mean that you cannot have both “me@myExchAccount.com” and “you@myExchAccount.com” Office 365 email Exchange accounts in the same Outlook profile? - I asking this before purchasing a second office 365 email Exchange account.
Hi, I get this but want to automate the creation/addition of email accounts process. So that one doesn't need to enter server details one at a time. Say I have a CSV with all the IMAP and SMTP server info and user account and password info. How can I automate the account creation process for say 50 accounts to be cr3ated within one profile?