Hi @Alexander Wall ,
Must tell you that the current Microsoft Q&A community only support English. If it is convenient, please post your questions in English.
Through machine translation, I learned that you want to create a shared folder, this folder should be integrated into the personal client as a subfolder so that it is available on all devices. Please clarify if there is any misunderstanding.
By research, this official article mentioned that Public folders aren't designed for the following purposes:
Data archiving. Users who have mailbox limits sometimes use public folders instead of mailboxes to archive data. This practice isn't recommended because it affects storage in public folders and undermines the goal of mailbox limits. Instead, we recommend that you use In-Place Archiving as your archiving solution.
Document sharing and collaboration. Public folders don't provide versioning or other document management features, such as controlled check-in and check-out functionality and automatic notifications of content changes. Instead, we recommend that you use SharePoint Online as your documentation sharing solution.
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