Memo : Change OWA 2003 accepted signature, file types, mime types etc…

Just a little reminder for me, there is a collection of registry keys in Exchange 2003 server that enables you to administer various OWA settings. One of the most anoying is the signature length that limits people to set the correct signature using the web-admin.

This is the path in the windows registry to alter these.
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeWEB\OWA]


Level1FileTypes                 >    String
Level1MIMETypes           >    String
Level2FileTypes                >    String
Level2MIMETypes          >    String
UseRegionalCharset        >    Dword    ( 1 / 0 )
DisablePassword                >    Dword    ( 1 / 0 )
KnownContentTypes     >     String
SignatureMaxLength     >     Dword

ALWAYS BACKUP YOUR REGISTRY KEYS BEFORE ALTERING THEM! USE THE REGEDIT EXPORT FUNCTION TO DO SO!

About the Levels the following is documented..

There are two levels of attachment security. Access to Level 1 files is blocked and can’t be changed. When you receive an attachment with a Level 2 file type, you will be prompted to save the file to your hard disk. If you use Microsoft Exchange Server, your system administrator can add and remove file types for both levels of e-mail security. If a file type is added to both levels, it will be treated as a Level 1 file type
http://office.microsoft.com/en-us/outlook/HP030850041033.aspx

Altering the SignatureMaxLength keep the following in mind;
The default SignatureMaxLength value is 4096 (4KB) and the maximum value is 16672 (16KB).
as documented here, http://forums.msexchange.org/Signature_Size_on_OWA/m_170055600/tm.htm
I didnt find the Microsoft documentation as of yet.

About Chris Gralike

Momenteel ben ik manager van de afdeling business continuity bij de zakelijke IT dienstverlener AMIS Services BV. Sinds 2003 ben ik actief in de ICT branche. Tussen 2003 en nu heb ik verschillende rollen vervuld. In de rollen: systeem- en netwerkbeheer, system engineer, servicemanager en nu practice manager ben ik in contact gekomen met uiteenlopende technologieën, methodologieën, ideeën, oplossingen en innovaties. Een rijke ervaring waarmee ik de klanten van Conclusion en AMIS elke dag probeer te ondersteunen. Mijn credo: 'Altijd opzoek een win-win tussen business en technologie.'

Posted on April 6, 2009, in Exchange Server, Windows Server and tagged , , , , , , , , , , , , , , , , , , . Bookmark the permalink. Leave a comment.

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