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Yes yes yes (and thanks for the explanation). That isn't the issue here. The issue is:
a. Being forced to 'rollback' (their word) to an earlier incarnation of Office to correct malfunctioning Word software.
b. Thus 'owning;' a different version of Outlook.
c. Being unable to log into new Outlook due to MS inability to process valid authentications.
d. Being unable to revert to 'legacy' (i.e. original) Outlook due to continued MS inability to process valid authentications.
In a perfect world I'd have a new computer and new software that didn't have compatibility issues. Everyone knows running unsupported software isn't ideal. Nevertheless that's where some of us find ourselves.
In that perfect world, Microsoft would answer for their crimes!
The software that we use is constantly being probed for bugs by researchers and hackers, the first to enable what they find to be fixed* and the second in order to exploit said bugs to attack people/organisations.
What that announcement is saying is that as of the 9th of July anyone using Outlook who received a maliciously crafted email with a link in it would, if that linked were to be clicked, allow the attacker to execute commands on the machine in question.
Microsoft fixed that, but this is a constant process - so the older your version is the more likely it is to be vulnerable to this type of attack.
In general you don’t want to allow yourself to be in a situation where you are running software that’s not received updates - especially something as widely used as Outlook as it’s very heavily attacked.
*Unless they work for a government of course…