Looks like more folks are expressing concern and getting no where:
https://answers.microsoft.com/en-us/outlook_com/forum/all/my-microsoft-storage-is-over-5-gb-but-my-email/febd53ac-9ee5-446b-a207-1f40c5d0572e
https://answers.microsoft.com/en-us/outlook_com/forum/all/how-much-free-storage-space-do-i-have-for-onedrive/eeaec729-4190-4b29-b8bf-4cb8bfc6e5ae
https://learn.microsoft.com/en-us/answers/questions/1185737/not-enough-storage-space-on-outlook-but-plenty-on
Here seems to be the source of how they are trying to explain the change:
https://support.microsoft.com/en-us/office/how-does-microsoft-storage-work-2a261b34-421c-4a47-9901-74ef5bd0c426#:~:text=You%20have%205%20GB%20of,from%20your%20Microsoft%20cloud%20storage



The more I look at this the more it looks like they are saying they want to keep all of the non-attachment email content toward your 15GB but attachments in outlook are limited to 5GB because they are also considered part of your overall storage limit from onedrive.
This looks like three things are happening:
- a forced push to make users buy more space
- an attempt to do 1 while also keeping all of the metadata they can from the emails that are contained in your hotmail account so they can utilize it to generate revenue.
a. the statement of 15gb is for outlook being available but then not really completely available appears to be either a true mistake/error in execution
or
b. potential attempt to give users of Microsoft owned email systems the illusion that they won't be impacted by the change until it slowly impacts a few folks over time and they eventually realize what's happened.
(I hope 3a is the right assessment and Microsoft can fix things.)
As an end user, I'd like to see Microsoft keep the 15gb for outlook, to include attachments, independent from the 5gb of onedrive storage, but I guess we'll have to see if they get on board with making changes.
If you found this thread through a search and/or are impacted by this problem, even if you don't have the time or opportunity to clearly describe your concerns but it's obvious it's related, please post in this thread to keep it on Microsoft's radar and hopefully they'll address it.