VB.NET classes to find and update Outlook appointments

I need some VB.net classes to search and update Outlook appointments. With the search class, I need to pass in an outlook item property or UserProperty and it will return a collection of Outlook appointments that fit the criteria. I also need to be able to pass in multiple properties (for instance 2 or more user properties) and it will return a collection of Outlook appointments that fit the criteria. With the update class, I will pass it an Outlook appointment with multiple UserProperties and it will update the existing appointment. The solution can use Redemption if this is necessary.