Long time customer here.
I have SpamSieve 2.9.29, High Sierra on a MacBook Air, Outlook 2016 and a very large Inbox.
I have gone through the documented install and elected to set it up with the InboxSpamSieve folder to be scanned every minute. I set up a rule that moves all new messages to the InboxSpamSieve folder but nothing good happens after that. The messages do not move to either Junk or Inbox and Outlook-Filter Mailboxes and SpamSieve both become unresponsive and have to be Force Quit.
It seems to me that InboxSpamSieve folder is not being monitored and the app is becoming unresponsive due to my large Inbox.
Thanks in advance for your help.