Hot answers tagged site-collection
I tried contacting Microsoft for the same requirement but I found this question is already answered by Microsoft support team. The reply from Microsoft Team was like Currently, the sub site limit is 2,000 for Office 365 subscriptions. We can see the limit here: SharePoint Online software boundaries and limits. For any changes, we will update the ...
Ootb this is not possible as every option have their own limitations. You already mentioned those. Now only choice is use third party tools which help you to get this done. You can try sharegate as they not too much costly also offer free trial. http://help.share-gate.com/article/914-promote-a-site-to-a-site-collection
I think 2000 subsite per site collection is just a threshold value. There will be impact on performance if your subsite count is more than 2000. Thats why Microsoft recommends upto 2000 subsites per site collection. https://support.office.com/en-us/article/SharePoint-Online-software-boundaries-and-limits-8f34ff47-b749-408b-abc0-b605e1f6d498
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