Change the limit for the number of characters in Friendly Name

By default, the limit is 1000 characters for Friendly Name when an e-mail 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 7

Registry Hive	HKEY_CURRENT_USER
Registry Path	software\policies\microsoft\office\15.0\outlook\options\mail
Value Name	friendlynamelimit
Value Type	REG_DWORD
Default Value	1000
Min Value
Max Value	99999

outlk15.admx

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