Copying Categories from Conversation to E-Mails

Hi,
I've created a searchfolder named "WithoutCategories" in Outlook with a filter to collect all my e-mails (sent and received) without categories. The folder works.
With the routine below, for each e-mail I'd like to get the conversation this e-mail is part of, copy the categories from the conversation and paste them to the e-mail.
I don't know why, but with some e-mail contained in the folder the routine copies and paste the categories, with some others it doesn't (even if the e-mail is part of a conversation). And no error message is given.
Can you help?

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For Each is not implemented correctly in VBA. Likely once you add a category the number of items in Myfolder changes. The first item is gone and number two moves up to number one. For Each does not realize this and moves to the new number two, skipping the new number one.

Either process item one until nothing is left in Myfolder, or process backwards.

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