Hello john-wayne-interessierts
Thank you for choosing Microsoft Community.
We will try our best to solve your doubts.
According to the /Outlook for Windows/ category you posted, we know your problem is "For other Computer" appears when exporting rules for POP3 accounts in Outlook. Please feel free to correct me if my understanding is wrong. I know that sometimes troubleshooting can take a while and the fact that the problem has not been resolved can be frustrating.
We can fully understand how you feel. Firstly, could you please try to check your rules on the original POP3 account. Due to the particularity of POP3 accounts, the rules are stored in a pst file. Please make sure that the all POP3 rules you export belong to the same the same .pst file.
Meanwhile, if the rule has "( for other computers )" after its name, it can be removed by double-clicking the rule and disabling the "On this computer only" action. Click File >> Select Mange rule & Alerts >> Double-click the rule>> Disable the rule action in the red box >> As shown in the screenshot:

Please feel free to let me know how it goes.
Best regards,
Chandy|Microsoft Community Support Specialist
* Beware of scammers posting fake support numbers here.