OWA signature length issue

A client  who was changing their email signatures wanted to standardise on the same sigs for Outlook based and OWA users. Then OWA started to complain that the signature was too big. On checking I realised that the default 2007 limit is quite small 4K but that with a registry change it could be increased to 16 K

The default SignatureMaxLength value is 4096 (4KB) and the maximum value is 16672 (16KB).


so you need to add to the registry

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesMSExchangeWeb OWA

SignatureMaxLength – DWORD  and set value to  4120 in Hex or 16672 in decimal


or save the lines below to a .reg file on the server in question and import that way

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesMSExchangeWeb OWA]