Outook email invitations not creating Act v21.1 activity when configured.
It is a known issue since Act v21.1 Update 1 - 4 was released. There is no KB relating with error.
The Act development team has been working on it since Act v21.1 was released. Major issue is in the time fields.
Recipient name could not be found when sending email from Outlook.
Act Address Book is no longer available in Outlook. You have to take extra step and use the actual Act "Address Book" from the Act! toolbar in Outlook.
Your options are closing Act or Activation. Unfortunatly, Act does not provide you a method to determine the full "update" version of Act installed. You can, however, determine what version of Act is installed from Control Panel / Program and Features