I don't think that clashing "bitness" is an issue these days. At one stage X1 and Outlook had to be the same. When you installed X1 it checked the bitness of Outlook and installed accordingly. More recently, X1 just goes with the flow and installs the version to match your operating system.
X1 can then eat 32-bit and 64-bit Outlook. But Microsoft generally seems to prefer the 32-bit version when installing.
Choose the 32-bit or 64-bit version of Office
This is mostly because the 64-bit version breaks all manner of Outlook and Office add ins. It does this in return for benefits that are irrelevant to 99.999% of users, like the ability to handle spreadsheets big enough to model the global economy. It is some time since I installed Office 365, but my memory is that you have to force it to install the 64-bit version of Office. I have 32-bit Outlook.
In your case, I assume that Outlook is behaving as it should in all circumstances apart from playing nicely with X1.
If I look at the Add-Ins in Outlook, I see that it warns that the X1 Outlook RTI Addin "caused Outlook to start slowly", with a delay of 0.656 seconds. It then offers to Disable this add-in.
X1 can then eat 32-bit and 64-bit Outlook. But Microsoft generally seems to prefer the 32-bit version when installing.
Choose the 32-bit or 64-bit version of Office
This is mostly because the 64-bit version breaks all manner of Outlook and Office add ins. It does this in return for benefits that are irrelevant to 99.999% of users, like the ability to handle spreadsheets big enough to model the global economy. It is some time since I installed Office 365, but my memory is that you have to force it to install the 64-bit version of Office. I have 32-bit Outlook.
In your case, I assume that Outlook is behaving as it should in all circumstances apart from playing nicely with X1.
If I look at the Add-Ins in Outlook, I see that it warns that the X1 Outlook RTI Addin "caused Outlook to start slowly", with a delay of 0.656 seconds. It then offers to Disable this add-in.