Daniel Petri is a world-known IT professional, technical trainer and creator of one of the world’s largest IT knowledge bases – www.petri.com. Daniel consults to leading global Fortune 1000 companies in Microsoft IT Infrastructure and Engineering strategies.

For his contribution to the IT Pro community Daniel has received the Microsoft Most Valuable Professional (MVP) award for the 14th time. Daniel’s professional certifications include Microsoft Certified Technology Specialist, Microsoft Certified Systems Engineer, Microsoft Certified System Administrator and Microsoft Certified Trainer.

While working for Microsoft, Daniel serves as a Senior Premier Field Engineer (PFE) specializing in Windows Server OS and Active Directory.
Daniel now works for ObserveIT, makers of the Insider Threat Detection software, where he holds the role of Senior Solutions Architect, where he manages large deployment projects and partner and customer training programs.

In his spare time, Daniel rides a 1200cc 2015 model Ducati Multistrada 1200S bike and manages the Israeli Bikers forum.

You can contact Daniel at daniel-at-petri-dot-co-dot-il.

Configure OWA 2003 Attachment Blocking

How do I configure attachment blocking in Outlook Web Access on Exchange Server 2003

MS KB 555001 by William Lefkovics (MS Exchange MVP) has more info:

There are 2 levels of file attachments for Outlook Web Access. Level1 attachments have file extensions that are prohibited from accessing by OWA. Level2 attachments have file extensions that can be accessed, but only if saved to the client’s file system first.

OWA is installed with a default set of file extensions for the two levels as shown in the following registry keys:

Level 1 attachments


Value: Level1FileTypes

Type: REG_SZ

Value Data:

Level 2 attachments


Value: Level2FileTypes

Type: REG_SZ

Value Data:


Attachments listed should be separated by a comma with no space.

Related articles

You may find these related articles of interest to you:

Related Topics:

  • Exchange Server
  • BECOME A PETRI MEMBER:

    Don't have a login but want to join the conversation? Sign up for a Petri Account

    Register