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Outlook is the e-mail client in the Microsoft Office package.

Blocked attachments Edit

Some attachments in Outlook may be blocked[1], giving the error message: "Outlook blocked access to the following potentially unsafe attachments". This can be fixed by whitelisting file extensions:

  • Open regedit, the registry editor
  • Browse to the following key (replace 11.0 with 12.0 for Outlook 2007):
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security
  • Change or insert a string value called:
Level1Remove
  • Set it to a semicolon-separated list of extensions to whitelist, e.g.:
.mdb;.exe;.doc
  • Or you can set it to the complete list:
.ade;.adp;.app;.asp;.bas;.bat;.cer;.chm;.cmd;.com;.cpl;.crt;.csh;.der;.exe;.fxp;.hlp;.hta;.inf;.ins;.isp;.its;.js;.jse;.ksh;.lnk;.mad;.maf;.mag;.mam;.maq;.mar;.mas;.mat;.mau;.mav;.maw;.mda;.mdb;.mde;.mdt;.mdw;.mdz;.msc;.msh;.msh1;.msh2;.msh1xml;.msh2xml;.mshxml;.msi;.msp;.mst;.ops;.pcd;.pif;.plg;.prf;.prg;.pst;.reg;.scf;.scr;.sct;.shb;.shs;.tmp;.url;.vb;.vbe;.vbs;.vsmacros;.vsw;.ws;.wsc;.wsf;.wsh
  • Restart outlook for the changes to take effect


How to change the fileas field for all contacts Edit

  • Microsoft KB269172
    • Claims to only work in outlook 2000, but it also works in outlook 2003, at least


External links Edit


References Edit

  1. List of default blocked file extensions in Outlook