I am running Quickens 32-bit and syntonizing reminders to Outlook work ok.
Is Quickens 64-bit can syntonize my reminders with Outlook
There is no 64bit Quicken. Probably never will be due to the effort to do it and it probably wouldn't help performance.
My error for the mistake, it is the other way around. Could Microsoft Outlook 365 64-bit, synconize with Quicken Classic.
There are different ways for connecting between an application like Quicken and Outlook.
Some of them will work even if one is 32-bit and the other is 64-bit, but others will not.
It seems that Quicken is using a way that will not work with this combination. This has come up many times in the past and the response from Quicken Inc has always been "it isn't possible".
I know that it is possible because I maintain an old program that is 32-bits that sends email through a 64-bit Outlook. I don't sync reminders, but that shouldn't be different. But I also, know that some of the API definitely will not work crossing the 32-bit to 64-bit boundary.
No. It never could and never will. If it's important to you to sync the two, you must use 32-bit Outlook, if you can still find it.
Microsoft Office defaults to 64-bit, but 32-bit Microsoft Office is available if you choose 32-bit during installation. If you already installed the 64-bit version, you need to uninstall it, and then reinstall choosing the 32-bit version.
But otherwise, I agree with @Rocket J Squirrel the 64-bit Microsoft Office will not sync with Quicken.