Change the limit for the number of recipients

By default, the limit is 12288 recipients included for an e-mail message when the message is converted from MIME to MAPI. The number can be set to any positive integer. This helps prevent scenarios in which Outlook hangs while attempting conversion.

Supported on: At least Windows Vista

Registry Hive	HKEY_CURRENT_USER
Registry Path	software\policies\microsoft\office\14.0\outlook\options\mail
Value Name	maxnumrecipients
Value Type	REG_DWORD
Default Value	12288
Min Value
Max Value	99999

outlk14.admx

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