How many email accounts can I add to the new Outlook?

Hi david290. There are varied responses online, in the varied Microsoft forums, for this. However, Microsoft support states "There is a limit for non-Microsoft Sync Technology based accounts—you can add 15 mail apps to the app and unlimited drive (storage) apps (OneDrive, Box, etc.)." You can check their https://support.microsoft.com/en-us/office/is-there-a-limit-to-how-many-accounts-i-can-add-to-my-outlook-app-13df5a8f-0112-4ba0-bf2c-b5865acf8982#:~:text=sign%20in%20with.-,Is%20there%20a%20limit%20to%20how%20many%20accounts,add%20to%20my%20Outlook%20app%3F&text=There%20is%20a%20limit%20for,%2C%20Box%2C%20etc.). to see for yourself as well. I know it may say Android and/or iOS, but it seems to function similarly for the new Outlook.

As for Microsoft's own email accounts, Microsoft isn't as forthcoming with limitations. I checked their https://support.microsoft.com/en-us/office/getting-started-with-the-new-outlook-for-windows-656bb8d9-5a60-49b2-a98b-ba7822bc7627#:~:text=Note:%20Limitation:%20The%20new%20Outlook,deploying%20Outlook%20in%20your%20organization. and didn't see any mention of limitations for Microsoft email accounts.

There seem to have been others, during the early stage, to have found workarounds. I have not personally tried those registry workarounds, so cannot speak to them. Mentioning them as it looks like it may have worked for some. You can check this https://answers.microsoft.com/en-us/outlook_com/forum/all/how-do-i-increase-the-limit-of-10-email-accounts/5ed7dec2-9311-4d34-aad9-10cbf20cbbd8 for more.

Hope this helps.