Hi
What the below line means - We can safely assume that Microsoft will not use Field 19 in the Contact table in future.
Thanks

Hi
What the below line means - We can safely assume that Microsoft will not use Field 19 in the Contact table in future.
Thanks
You’re safe. To this day it is not used. Typically field IDs of 50000 or more are used on standard tables. It makes it easier to identify them as custom