For those of you who have created an Outlook 98 package, you may or may not have had to go through the process of digitally signing all the cabs. Microsoft supply a couple of tools which you can use to digitally sign these yourself, however, when running the install you then have to go through the process of saying you trust an install from 'Joe's Software Emporium', with a certificate  called 'My Test Certificate'

All in all, it looks pretty unprofessional. But don't fret, there's no need to go and pay to get the install signed by another company yet! Simply, this is just an entry in the registry. Add it in, and hey presto, no more prompts!

The actual key itself is pretty weird, but this is it.

HKLM\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing\Trust Database\0\ipippnjeaipiegabfinbdkckeacoemhd bcnjefphhbkfnebbifejaaaaocchonnc=My Test Certificate

If you use this, please cut and past the Value Name, as it does have a space in between that may not display!

For those that have deployed Outlook 98 before, you may not have ever needed to sign your packages. The problem lies with the machine the package is created on. Microsoft however, have a good explanation of this in articles Q197713 and Q235668.