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Hi @Tomasz Pomietło ,
Welcome to our forum!
Do you mean the folder names with slash as shown in the below image?
If so, as i know, there's nothing in Outlook desktop client limits this. It's by design.
Many features of our current products are designed and upgraded based on customers’ feedback. If you have any suggestions or ideas, It is recommended that you could post the functions you expect and your sincere suggestions on the website dedicated to collecting feedback. We sincerely welcome your suggestions, and thanks for your understanding and support!
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