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Multiple Exchange accounts limit


Outlook 2007 and lower only allow one exchange account per outlook profile.

Outlook 2010 and higher allow by default 10 Exchange accounts per outlook profile. When you try to add more, you'll receive the following information popup:

Additional Microsoft Exchange Server accounts cannot be added to this profile. The maximum number of accounts have been added or your Exchange Server administrator has prohibited additional accounts.

Please be notified: With a single Exchange account, you can again connect to multiple mailboxes that are hosted within the same Exchange Organization. These additional mailboxes do not count towards the accounts limit.

If you really want to increase the number of exchange accounts, this can be done by a registry tweak.

For Outlook 2010 the absolute maximum is 9999.

For Outlook 2013 the absolute maximum is 370000.

Increasing the limit to 9999 Exchange accounts:

To increase the limit to up to 9999 Exchange accounts, the following Registry value needs to be created.

Key: HKEY_CURRENT_USER\Software\Microsoft\Exchange
Value name: maxnumexchange
Value type: REG_DWORD

Note 1: When you are using Outlook 2013, it is also recommended to set the below Registry key to prevent some crashing issues. You can then also increase the above value to up to 370000.

Note 2: While Outlook 2010 was still in BETA, the limit has been increased multiple times during BETA refreshes. You may still find some information referring to a default maximum of 3 and an absolute maximum of 15. This no longer applies.

Increasing the limit to 370000 Exchange accounts

To increase the above limit to up to 370000 Exchange accounts in Outlook 2013, you’ll need to apply Hotfix KB2889951 or a later update. In addition, you must set the following Registry value as well.

Key: HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook
Value name: UseLargeEMSInstCtxHeap
Value type: REG_DWORD
Value data: 1



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