DCT  BEWARE: After paying, you will not receive a license. I have sent three emails to the author with no response. Fortunately, I paid with AMEX through PayPal so I can dispute the payment.  
(Version 2.1)

REALGUY  This may be great software - but after having it loaded for 24 hours, and starting/stopping Mail.app perhaps 5 times, I do NOT want to be asked every single time I open the app if I am ready to pay yet!

I requested the DEMO period ONCE. I expect to get through the demo until I am asked AGAIN.

I have removed the software - so it never had a chance to show me what it could do. If the developer rethinks that strategy (and also includes an UNinstall), I would try it again some day.  
(Version 2.1)

GRYPHONENT  How does this compare to YAI, which sells for $4 and - from what I can see - does exactly the same as OMiC.  
(Version 1.7.6)

GUILLAUMEK  Free alternative: TNEF's Enough

This is not a Mail plugin though.  
(Version 1.7.5)

APIKOROS  I must revise my previous review. It seems to have been one particular file that OMiC choked on and that crashed it. Since then, it has worked well on two other files received. (Side note: the author asked me to send him the file that cashed OMiC and I did. I later e-mailed to ask him if he had figured out the problem, but he was not courteous enough to reply.)  
(Version 1.7.4)

THESUN  I don't understand how this feature is not provided by Apple, with so many Windows users out there running Outlook, you keep getting Winmail.dat files which are unusable on any mailer except for Outlook!

Christopher Atlan to the rescue with a wonderfully smooth application that was easy to install and even easier to purchase and activate. I wish all software was like this.

It delivers on its promise, and actually does a bit more than that, for example I never expected the support for calendar requests but it just works wonderfully!

Thank you Christopher! :-)  
(Version 1.7.4)

MBERG  Amazingly good little program for those DAMN winmail.dat files all our PeeCee colleagues at work keep unknowingly sending us. I tried to get IT to 'uncheck' the box on outlook mail that automatically sends these unusuable files, but everytime there was an update at work we went BACKWORDS.

Ive been downloading and converting these files for 2 years. A pain. This program automatically converts them to mac friendly USABLE files (iCal, etc.).

I used it ONCE and payed the registration fee. Its that good.  
(Version 1.7.3)

FDEFINOJR  A great little easy to install app that seamlessly allows you to get around those silly looking win.dat files without manual steps.

If you need to receive files from business associates that send then in win.dat format because of the way their machines and software is configured, this app makes it easy and painless to view their attached files. The senders of win.dat files probably don't know that their files are being sent that way, and, with the broad array of software and operating systems in todays home and workplace, this app will take care of being sure that they mac user has no excuse to stay on a mac! In short, it seems to me that this app keeps up with how Apple keeps up and leads the way with their software. This app almost reminds me of something that is written to address the pc community that is still using programs that are years behind the mac and fixes it.

Nice job Christopher!!  
(Version 1.7.3)

MAKGEEK  Fantastic Program, should be built in. Apple make this guy an offer.  
(Version 1.6)

KASPAR  Perfect little tool. Works flawlessly.  
(Version 1.5)